{"id":17881,"date":"2026-03-02T23:40:26","date_gmt":"2026-03-02T22:40:26","guid":{"rendered":"https:\/\/valintermed.com\/?p=17881"},"modified":"2026-03-02T23:40:26","modified_gmt":"2026-03-02T22:40:26","slug":"vitaminy-i-sezonnye-izmeneniya-kak-podgotovitsya-k-oseni-i-vesne","status":"publish","type":"post","link":"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/","title":{"rendered":"Vitamins and seasonal changes: how to prepare for autumn and spring"},"content":{"rendered":"<div class=\"fpm_start\"><\/div>\n<p>The autumn wind is already rustling in the foliage, and spring \u2014 unexpectedly \u2014 bursts in with the first thaw and a sharp temperature drop. And every time the season changes, we notice: energy drops, mood becomes \"gray,\" skin dries out, and immunity seems to fall asleep. This is not just \"feeling unwell\" \u2014 it is the body's reaction to deep biological changes related to the length of the day, the level of ultraviolet light, temperature, and even the composition of food. Vitamins here are not \"supplements,\" but regulators of metabolism, cell protectors, and builders of the immune system. But it is important to understand: not all vitamins are equally needed in September and April. Some \u2014 for example, vitamin D \u2014 whose deficiency is particularly felt in autumn \u2014 require prevention long before you feel fatigue. Others, like vitamin C or the B group, become critically important during the active tissue renewal period in spring. And yes \u2014 this is not an advertisement for dietary supplements. This is a matter of physiology: if the body does not receive the necessary cofactors, it simply cannot function in the new mode. Therefore, preparing for the season is not about \"taking a pill,\" but about building a support cycle that starts 4\u20136 weeks before the weather changes.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-flat ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" 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href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%9A%D0%BB%D0%B0%D1%81%D1%81%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D1%8F_%D0%BF%D0%BE_%D0%9C%D0%9A%D0%91-11_%D0%B4%D0%B5%D1%84%D0%B8%D1%86%D0%B8%D1%82%D0%BD%D1%8B%D0%B5_%D1%81%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%B8%D1%8F_%D0%B8_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5_%D0%B0%D0%B4%D0%B0%D0%BF%D1%82%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5_%D0%BD%D0%B0%D1%80%D1%83%D1%88%D0%B5%D0%BD%D0%B8%D1%8F\" >Classification according to ICD-11: deficiency states and seasonal adaptation disorders<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%98%D1%81%D1%82%D0%BE%D1%80%D0%B8%D1%8F_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D1%8B%D1%85_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D1%8B%D1%85_%D0%BF%D1%80%D0%BE%D0%B1%D0%BB%D0%B5%D0%BC_%D0%BE%D1%82_%D0%BC%D0%BE%D1%80%D1%81%D0%BA%D0%BE%D0%B9_%D0%B1%D0%BE%D0%BB%D0%B5%D0%B7%D0%BD%D0%B8_%D0%B4%D0%BE_%D0%BF%D0%BE%D0%BB%D1%8F%D1%80%D0%BD%D1%8B%D1%85_%D1%8D%D0%BA%D1%81%D0%BF%D0%B5%D0%B4%D0%B8%D1%86%D0%B8%D0%B9\" >The history of seasonal vitamin problems: from seasickness to polar expeditions<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%AD%D0%BF%D0%B8%D0%B4%D0%B5%D0%BC%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F_%D1%81%D0%BA%D0%BE%D0%BB%D1%8C%D0%BA%D0%BE_%D0%BB%D1%8E%D0%B4%D0%B5%D0%B9_%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE_%D1%81%D1%82%D1%80%D0%B0%D0%B4%D0%B0%D1%8E%D1%82_%D0%BE%D1%82_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B4%D0%B8%D1%81%D0%B1%D0%B0%D0%BB%D0%B0%D0%BD%D1%81%D0%B0\" >Epidemiology: how many people actually suffer from seasonal vitamin imbalance?<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%93%D0%B5%D0%BD%D0%B5%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F_%D0%BF%D1%80%D0%B5%D0%B4%D1%80%D0%B0%D1%81%D0%BF%D0%BE%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D1%8C_%D0%BF%D0%BE%D1%87%D0%B5%D0%BC%D1%83_%D0%BE%D0%B4%D0%BD%D0%B8_%D0%BB%D0%B5%D0%B3%D0%BA%D0%BE_%D0%BF%D0%B5%D1%80%D0%B5%D0%BD%D0%BE%D1%81%D1%8F%D1%82_%D0%BE%D1%81%D0%B5%D0%BD%D1%8C_%D0%B0_%D0%B4%D1%80%D1%83%D0%B3%D0%B8%D0%B5_%E2%80%94_%D0%BD%D0%B5%D1%82\" >Genetic predisposition: why do some people cope with autumn easily, while others do not?<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%A4%D0%B0%D0%BA%D1%82%D0%BE%D1%80%D1%8B_%D1%80%D0%B8%D1%81%D0%BA%D0%B0_%D1%87%D1%82%D0%BE_%D0%BA%D1%80%D0%BE%D0%BC%D0%B5_%D0%BF%D0%BE%D0%B3%D0%BE%D0%B4%D1%8B_%D0%B2%D0%BB%D0%B8%D1%8F%D0%B5%D1%82_%D0%BD%D0%B0_%D0%B2%D0%B0%D1%88_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D1%8B%D0%B9_%D0%B1%D0%B0%D0%BB%D0%B0%D0%BD%D1%81\" >Risk factors: what besides the weather affects your vitamin balance?<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%94%D0%B8%D0%B0%D0%B3%D0%BD%D0%BE%D1%81%D1%82%D0%B8%D0%BA%D0%B0_%D0%BA%D0%B0%D0%BA_%D0%BF%D0%BE%D0%BD%D1%8F%D1%82%D1%8C_%D1%87%D1%82%D0%BE_%D0%B2%D0%B0%D0%BC_%D0%BD%D0%B5_%D1%85%D0%B2%D0%B0%D1%82%D0%B0%D0%B5%D1%82_%D0%B8%D0%BC%D0%B5%D0%BD%D0%BD%D0%BE_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BE%D0%B2_%D0%B0_%D0%BD%D0%B5_%D0%BF%D1%80%D0%BE%D1%81%D1%82%D0%BE_%C2%AB%D0%B2%D1%8B_%D1%83%D1%81%D1%82%D0%B0%D0%BB%D0%B8%C2%BB\" >Diagnosis: how to understand that you are lacking vitamins, and it\u2019s not just \"you are tired\"?<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%9B%D0%B5%D1%87%D0%B5%D0%BD%D0%B8%D0%B5_%D0%BA%D0%B0%D0%BA_%D0%B2%D0%BE%D1%81%D0%BF%D0%BE%D0%BB%D0%BD%D0%B8%D1%82%D1%8C_%D0%B4%D0%B5%D1%84%D0%B8%D1%86%D0%B8%D1%82_%E2%80%94_%D0%BF%D1%80%D0%B0%D0%B2%D0%B8%D0%BB%D1%8C%D0%BD%D0%BE_%D0%B8_%D0%B1%D0%B5%D0%B7%D0%BE%D0%BF%D0%B0%D1%81%D0%BD%D0%BE\" >Treatment: how to replenish the deficiency \u2014 correctly and safely<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%A1%D0%BF%D0%B8%D1%81%D0%BE%D0%BA_%D0%BF%D1%80%D0%B5%D0%BF%D0%B0%D1%80%D0%B0%D1%82%D0%BE%D0%B2_%D0%BA%D0%B0%D0%BA%D0%B8%D0%B5_%D1%84%D0%BE%D1%80%D0%BC%D1%8B_%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE_%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0%D1%8E%D1%82\" >List of medications: which forms really work<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%9C%D0%BE%D0%BD%D0%B8%D1%82%D0%BE%D1%80%D0%B8%D0%BD%D0%B3_%D0%B8_%D0%BF%D1%80%D0%BE%D0%B3%D0%BD%D0%BE%D0%B7_%D0%BA%D0%B0%D0%BA_%D0%BD%D0%B5_%C2%AB%D0%BF%D0%B5%D1%80%D0%B5%D0%B3%D0%BD%D1%83%D1%82%D1%8C_%D0%BF%D0%B0%D0%BB%D0%BA%D1%83%C2%BB_%D0%B8_%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0_%D0%B6%D0%B4%D0%B0%D1%82%D1%8C_%D1%80%D0%B5%D0%B7%D1%83%D0%BB%D1%8C%D1%82%D0%B0%D1%82%D0%BE%D0%B2\" >Monitoring and forecasting: how not to \"overdo it\" and when to expect results<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%92%D0%BE%D0%B7%D1%80%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5_%D0%BE%D1%81%D0%BE%D0%B1%D0%B5%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D0%BA%D0%B0%D0%BA_%D0%BC%D0%B5%D0%BD%D1%8F%D1%8E%D1%82%D1%81%D1%8F_%D0%BF%D0%BE%D1%82%D1%80%D0%B5%D0%B1%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D1%81_%D0%B3%D0%BE%D0%B4%D0%B0%D0%BC%D0%B8\" >Age-related features: how needs change over the years<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%92%D0%BE%D0%BF%D1%80%D0%BE%D1%81%D1%8B_%D0%B8_%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D1%8B_%D1%81%D0%B0%D0%BC%D1%8B%D0%B5_%D1%87%D0%B0%D1%81%D1%82%D1%8B%D0%B5_%D0%B7%D0%B0%D0%BF%D1%80%D0%BE%D1%81%D1%8B_%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D0%B5%D0%B9\" >Questions and answers: the most frequent user inquiries<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/valintermed.com\/en\/medlibrary\/vitamins-and-seasonal-changes-how-to-prepare-for-autumn-and-spring-2\/#%D0%98%D1%82%D0%BE%D0%B3_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD_%E2%80%94_%D0%BD%D0%B5_%D0%B2%D1%80%D0%B0%D0%B3_%D0%B0_%D1%81%D0%B8%D0%B3%D0%BD%D0%B0%D0%BB_%D0%B4%D0%BB%D1%8F_%D0%B7%D0%B0%D0%B1%D0%BE%D1%82%D1%8B_%D0%BE_%D1%81%D0%B5%D0%B1%D0%B5\" >Conclusion: the season is not an enemy, but a signal to take care of yourself.<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D0%9A%D0%BB%D0%B0%D1%81%D1%81%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D1%8F_%D0%BF%D0%BE_%D0%9C%D0%9A%D0%91-11_%D0%B4%D0%B5%D1%84%D0%B8%D1%86%D0%B8%D1%82%D0%BD%D1%8B%D0%B5_%D1%81%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%B8%D1%8F_%D0%B8_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5_%D0%B0%D0%B4%D0%B0%D0%BF%D1%82%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5_%D0%BD%D0%B0%D1%80%D1%83%D1%88%D0%B5%D0%BD%D0%B8%D1%8F\"><\/span>Classification according to ICD-11: deficiency states and seasonal adaptation disorders<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In the International Classification of Diseases 11th Revision (ICD-11), there is no separate code for \"seasonal weakness\" \u2014 because it is not a diagnosis, but a syndrome caused by a complex of factors. However, the main underlying causes have clear codes:<\/p>\n<ul>\n<li><strong>EN50.0\u2013EN50.9<\/strong> \u2014 vitamin D deficiency (including rickets in children and osteomalacia in adults);<\/li>\n<li><strong>EN51.0\u2013EN51.9<\/strong> \u2014 vitamin C deficiency (scurvy and its precursors);<\/li>\n<li><strong>EN52.0\u2013EN52.9<\/strong> \u2014 deficiency of B vitamins (especially B1, B2, B6, B12, and folic acid);<\/li>\n<li><strong>EN53.0\u2013EN53.9<\/strong> \u2014 vitamin A deficiency (xerophthalmia, hyperkeratosis);<\/li>\n<li><strong>EN54.0\u2013EN54.9<\/strong> \u2014 vitamin E deficiency (neurological disorders, hemolytic anemia);<\/li>\n<li><strong>QE85.0<\/strong> \u2014 \"Seasonal Affective Disorder\" (SAD), related to changes in light patterns;<\/li>\n<li><strong>QA70.0<\/strong> \u2014 \"Immunosuppression caused by nutrient deficiency.\"<\/li>\n<\/ul>\n<p>Important: most people experiencing \"autumn apathy\" or \"spring fatigue\" do not suffer from clinical deficiency \u2014 but are in the zone of **functional deficiency**. That is, the level of vitamins in the blood is still within the norm, but not sufficient for the optimal functioning of enzyme systems. For example, with a concentration of 25(OH)D = 28 ng\/ml, a person formally does not have a vitamin D deficiency (below 20 ng\/ml \u2014 deficiency), but to maintain immune activity and serotonin synthesis, a minimum of 35\u201340 ng\/ml is recommended. It is this \"gray zone\" that explains why some feel great in September, while others feel like they have gone three days without sleep.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%98%D1%81%D1%82%D0%BE%D1%80%D0%B8%D1%8F_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D1%8B%D1%85_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D1%8B%D1%85_%D0%BF%D1%80%D0%BE%D0%B1%D0%BB%D0%B5%D0%BC_%D0%BE%D1%82_%D0%BC%D0%BE%D1%80%D1%81%D0%BA%D0%BE%D0%B9_%D0%B1%D0%BE%D0%BB%D0%B5%D0%B7%D0%BD%D0%B8_%D0%B4%D0%BE_%D0%BF%D0%BE%D0%BB%D1%8F%D1%80%D0%BD%D1%8B%D1%85_%D1%8D%D0%BA%D1%81%D0%BF%D0%B5%D0%B4%D0%B8%D1%86%D0%B8%D0%B9\"><\/span>The history of seasonal vitamin problems: from seasickness to polar expeditions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>As early as the 18th century, English physician James Lind conducted the first controlled clinical experiment: he gave a group of sailors lemon juice \u2014 and those who received it did not get scurvy. Before that, it was believed that the disease was caused by \"bad air\" or dirt on ships. Lind proved: it is a deficiency of a substance found in fresh fruits. His work laid the foundation for a scientific approach to nutrition.<br \/>\nBut what is more interesting is how people coped with seasonal hunger before the advent of vitamin supplements. In Scandinavia, where the sun hardly shines in winter, they used **fermented fish oil** \u2014 a source of vitamin D and Omega-3. In Russia \u2014 salted caviar, cod liver, sauerkraut (a source of vitamin C). In Japan \u2014 nori seaweed and miso \u2014 rich in B vitamins and trace elements. These traditions were not random: they were formed over centuries under the pressure of natural selection. Those who preserved vitamin reserves survived winter better and passed their genes to the next generation.<br \/>\nIn the 20th century, with the advent of synthetic vitamins, the situation changed dramatically: in the 1930s, vitamin C began to be produced in tablets, and in the 1940s \u2014 vitamin D in the form of an oily solution. But here\u2019s the paradox: the more vitamins we began to consume in the form of dietary supplements, the more often the **syndrome of excessive intake** arose \u2014 especially among those who take \"immune complexes\" without blood tests. For example, chronic overdose of vitamin A leads to headaches, dry skin, and even increased intracranial pressure. And excess vitamin D leads to hypercalcemia and kidney stones. So the story is not only about deficiency \u2014 it is also about balance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%AD%D0%BF%D0%B8%D0%B4%D0%B5%D0%BC%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F_%D1%81%D0%BA%D0%BE%D0%BB%D1%8C%D0%BA%D0%BE_%D0%BB%D1%8E%D0%B4%D0%B5%D0%B9_%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE_%D1%81%D1%82%D1%80%D0%B0%D0%B4%D0%B0%D1%8E%D1%82_%D0%BE%D1%82_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B4%D0%B8%D1%81%D0%B1%D0%B0%D0%BB%D0%B0%D0%BD%D1%81%D0%B0\"><\/span>Epidemiology: how many people actually suffer from seasonal vitamin imbalance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>According to Rospotrebnadzor (2024), during the autumn-winter period, vitamin D deficiency is identified in **68% of the adult population** of Russia, including:<\/p>\n<ul>\n<li>74% of women aged 25\u201345;<\/li>\n<li>62% of men aged 30\u201350;<\/li>\n<li>81% of elderly people over 65 years old.<\/li>\n<\/ul>\n<p>These figures confirm the research of the Institute of Nutrition of the Russian Academy of Sciences: a level of 25(OH)D below 30 ng\/ml is observed in 2\/3 of urban residents in November\u2013February. At the same time, only 12% of them take vitamin D prophylactically.<br \/>\nAs for vitamin C: according to WHO, the average daily intake for adults in Russia is 55\u201365 mg, while the recommended norm is 90 mg for men and 75 mg for women (and up to 120 mg when smoking or under stress). In 41% of respondents in the \"Rosstat-2025\" study, a level below 50 mg\/day was recorded \u2014 especially in regions with limited access to fresh vegetables and fruits.<br \/>\nRisk groups:<\/p>\n<ul>\n<li>Residents of northern latitudes (Murmansk, Norilsk, Yakutsk) \u2014 due to the lack of UV radiation for 5\u20137 months a year;<\/li>\n<li>People with dark skin \u2014 melanin blocks the synthesis of vitamin D, requiring 3\u20136 times more sunlight;<\/li>\n<li>Patients with gastrointestinal diseases (Crohn's disease, celiac disease) \u2014 impaired absorption of fat-soluble vitamins;<\/li>\n<li>Elderly \u2014 reduced kidney and liver function, which are involved in the activation of vitamin D;<\/li>\n<li>Teenagers and students \u2014 high energy expenditure with irregular nutrition.<\/li>\n<\/ul>\n<p>An interesting fact: in 2023, a mass screening was conducted in the Yaroslavl region \u2014 and it turned out that among high school students in grades 9\u201311, the level of vitamin D in October was on average 22% lower than in May. At the same time, 64% of them received no prophylaxis. This is not \"weakness\" \u2014 it is a physiological reality that cannot be ignored.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%93%D0%B5%D0%BD%D0%B5%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F_%D0%BF%D1%80%D0%B5%D0%B4%D1%80%D0%B0%D1%81%D0%BF%D0%BE%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D1%8C_%D0%BF%D0%BE%D1%87%D0%B5%D0%BC%D1%83_%D0%BE%D0%B4%D0%BD%D0%B8_%D0%BB%D0%B5%D0%B3%D0%BA%D0%BE_%D0%BF%D0%B5%D1%80%D0%B5%D0%BD%D0%BE%D1%81%D1%8F%D1%82_%D0%BE%D1%81%D0%B5%D0%BD%D1%8C_%D0%B0_%D0%B4%D1%80%D1%83%D0%B3%D0%B8%D0%B5_%E2%80%94_%D0%BD%D0%B5%D1%82\"><\/span>Genetic predisposition: why do some people cope with autumn easily, while others do not?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Not everyone absorbs vitamins equally \u2014 and this depends on genes. The most studied example is polymorphisms in the gene <strong>CYP2R1<\/strong> and <strong>GC<\/strong>, responsible for the metabolism of vitamin D. In people with the rs10741657 variant (A-allele), the synthesis of 25(OH)D in the liver is reduced by 15\u201320% compared to the G-allele. This means that even with the same sun exposure and supplement intake, their levels will be lower.<br \/>\nAnother key gene \u2014 <strong>MTHFR<\/strong> (methylenetetrahydrofolate reductase). Its C677T mutation occurs in 30\u201340% of the Russian-speaking population and leads to reduced absorption of folic acid (vitamin B9). This is especially important in the fall when the body prepares to recover from summer stress: folate is involved in DNA synthesis and cell regeneration. People with this mutation often suffer from fatigue, dizziness, and sleep disturbances \u2014 and they need not just \"vitamin B,\" but specifically **methylfolate** (the active form).<br \/>\nThe gene <strong>SLC23A1<\/strong> encodes the vitamin C transporter in the intestine. The rs33972313 polymorphism reduces the absorption of ascorbic acid by 10\u201315%. This explains why some people can drink a liter of orange juice and still have low levels of vitamin C in their blood.<br \/>\nAnd yes \u2014 genetics is not destiny. But knowing your genotype (for example, through tests like Genotek or Invitro) allows for personalized prevention. If you have the MTHFR mutation \u2014 it\u2019s not worth buying cheap complexes with folic acid: they will be ineffective. It\u2019s better to choose a form with methylfolate and vitamin B12 in the form of methylcobalamin. This is not \"expensive,\" but **rational**.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%A4%D0%B0%D0%BA%D1%82%D0%BE%D1%80%D1%8B_%D1%80%D0%B8%D1%81%D0%BA%D0%B0_%D1%87%D1%82%D0%BE_%D0%BA%D1%80%D0%BE%D0%BC%D0%B5_%D0%BF%D0%BE%D0%B3%D0%BE%D0%B4%D1%8B_%D0%B2%D0%BB%D0%B8%D1%8F%D0%B5%D1%82_%D0%BD%D0%B0_%D0%B2%D0%B0%D1%88_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BD%D1%8B%D0%B9_%D0%B1%D0%B0%D0%BB%D0%B0%D0%BD%D1%81\"><\/span>Risk factors: what besides the weather affects your vitamin balance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The season is just a trigger. The real imbalance is formed under the influence of many factors:<br \/>\n<strong>Physical:<\/strong><\/p><script data-noptimize=\"\" data-wpfc-render=\"false\">\nfpm_start( \"true\" );\n<\/script>\n\n<ul>\n<li>Lack of UV radiation \u2014 the main factor of autumn D deficiency. In 1 hour outdoors in September on a clear day, you synthesize ~200\u2013400 IU of vitamin D, while in January \u2014 less than 50 IU;<\/li>\n<li>Chronic stress \u2014 increases the consumption of vitamins B1, B5, C, and magnesium. Adrenaline and cortisol \"burn\" these cofactors as fuel;<\/li>\n<li>Low physical activity \u2014 slows down circulation and metabolism, reducing the delivery of vitamins to tissues.<\/li>\n<\/ul>\n<p><strong>Chemical and dietary:<\/strong><\/p>\n<ul>\n<li>Caffeine and alcohol \u2014 increase the excretion of vitamins B and C through the kidneys;<\/li>\n<li>Smoking \u2014 reduces vitamin C levels by 25\u201340% due to oxidative stress;<\/li>\n<li>Abundance of refined carbohydrates \u2014 leads to a deficiency of B1 (thiamine), as its metabolism is linked to glucose;<\/li>\n<li>The intake of certain medications: anticonvulsants (carbamazepine), hormonal contraceptives, statins \u2014 reduce levels of vitamins D, E, K, and the B group.<\/li>\n<\/ul>\n<p>The combination is especially dangerous: for example, a 35-year-old woman, working in an office, drinks 3 cups of coffee a day, smokes, takes OCs \u2014 and in September complains of fatigue. Here it\u2019s not \"autumn,\" but a **combination of factors** that can be corrected. And yes \u2014 even if you eat \"healthy\" food, but it is low in fats, you will not absorb vitamins A, D, E, K. Because they are fat-soluble. Without oil, avocado, or nuts \u2014 they will simply be excreted with feces.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%94%D0%B8%D0%B0%D0%B3%D0%BD%D0%BE%D1%81%D1%82%D0%B8%D0%BA%D0%B0_%D0%BA%D0%B0%D0%BA_%D0%BF%D0%BE%D0%BD%D1%8F%D1%82%D1%8C_%D1%87%D1%82%D0%BE_%D0%B2%D0%B0%D0%BC_%D0%BD%D0%B5_%D1%85%D0%B2%D0%B0%D1%82%D0%B0%D0%B5%D1%82_%D0%B8%D0%BC%D0%B5%D0%BD%D0%BD%D0%BE_%D0%B2%D0%B8%D1%82%D0%B0%D0%BC%D0%B8%D0%BD%D0%BE%D0%B2_%D0%B0_%D0%BD%D0%B5_%D0%BF%D1%80%D0%BE%D1%81%D1%82%D0%BE_%C2%AB%D0%B2%D1%8B_%D1%83%D1%81%D1%82%D0%B0%D0%BB%D0%B8%C2%BB\"><\/span>Diagnosis: how to understand that you are lacking vitamins, and it\u2019s not just \"you are tired\"?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The first step is not to rush to the pharmacy, but to pay attention to **typical symptoms**:<\/p>\n<ul>\n<li><strong>Vitamin D:<\/strong> chronic fatigue, joint and muscle pain, frequent ARVI, depressive states, dry skin;<\/li>\n<li><strong>Vitamin C:<\/strong> bleeding gums, slow wound healing, brittle nails, \"spots\" on the skin (petechiae);<\/li>\n<li><strong>B vitamins:<\/strong> numbness of limbs (B12), peeling skin around the nose (B2), cracks in the corners of the mouth (B6), irritability and sleep disturbances (B1, B6);<\/li>\n<li><strong>Vitamin A:<\/strong> \"night blindness\" (difficulty seeing in twilight), dry eyes, frequent conjunctivitis;<\/li>\n<li><strong>Vitamin E:<\/strong> muscle weakness, coordination disorders, anemia.<\/li>\n<\/ul>\n<p>But symptoms are just a hint. Accurate diagnosis requires tests:<\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<tr>\n<th>Indicator<\/th>\n<th>Normal (adults)<\/th>\n<th>What it shows<\/th>\n<th>When to test<\/th>\n<\/tr>\n<tr>\n<td>25(OH)D<\/td>\n<td>30\u2013100 ng\/ml<\/td>\n<td>Level of vitamin D reserves<\/td>\n<td>From September to February \u2014 for prevention<\/td>\n<\/tr>\n<tr>\n<td>Ascorbic acid in plasma<\/td>\n<td>\u2265 0.6 mg\/dl<\/td>\n<td>Current vitamin C reserve<\/td>\n<td>In case of frequent colds or after stress<\/td>\n<\/tr>\n<tr>\n<td>Folic acid in serum<\/td>\n<td>\u2265 3 ng\/ml<\/td>\n<td>Level B9 (but does not reflect tissue reserves)<\/td>\n<td>Before planning pregnancy or in case of anemia<\/td>\n<\/tr>\n<tr>\n<td>Cyanocobalamin (B12)<\/td>\n<td>200\u2013900 pg\/ml<\/td>\n<td>Deficiency \u2192 neurological disorders<\/td>\n<td>In case of numbness, weakness, memory impairment<\/td>\n<\/tr>\n<tr>\n<td>Homocysteine<\/td>\n<td>\u2264 10 \u00b5mol\/l<\/td>\n<td>Indirect marker of B6, B9, B12 deficiency<\/td>\n<td>In case of suspected hyperhomocysteinemia<\/td>\n<\/tr>\n<\/table>\n<p>Important: do not take \"everything at once.\" It is better to start with 25(OH)D and a complete blood count (CBC + CRP) to rule out anemia or inflammation. If the D level is low \u2014 check parathyroid hormone (PTH): in case of D deficiency, it increases, indicating secondary hyperparathyroidism. This is already a serious signal \u2014 it requires not just taking a vitamin, but monitoring after 3 months.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%9B%D0%B5%D1%87%D0%B5%D0%BD%D0%B8%D0%B5_%D0%BA%D0%B0%D0%BA_%D0%B2%D0%BE%D1%81%D0%BF%D0%BE%D0%BB%D0%BD%D0%B8%D1%82%D1%8C_%D0%B4%D0%B5%D1%84%D0%B8%D1%86%D0%B8%D1%82_%E2%80%94_%D0%BF%D1%80%D0%B0%D0%B2%D0%B8%D0%BB%D1%8C%D0%BD%D0%BE_%D0%B8_%D0%B1%D0%B5%D0%B7%D0%BE%D0%BF%D0%B0%D1%81%D0%BD%D0%BE\"><\/span>Treatment: how to replenish the deficiency \u2014 correctly and safely<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Treatment is not \"take a pill for a month.\" It is a **correction cycle**, consisting of three stages:<br \/>\n<strong>1. Loading phase (2\u20134 weeks)<\/strong><br \/>\nThe goal is to quickly raise the level to therapeutic. Examples:<\/p>\n<ul>\n<li>Vitamin D: 5000\u201310,000 IU\/day orally (oil solution or capsules). No more than 4 weeks without monitoring;<\/li>\n<li>Vitamin C: 500\u20131000 mg twice a day (preferably in the form of sodium ascorbate \u2014 less irritating to the stomach);<\/li>\n<li>Group B: complex with methylfolate and methylcobalamin \u2014 1 tablet in the morning.<\/li>\n<\/ul>\n<p><strong>2. Maintenance phase (3\u20136 months)<\/strong><br \/>\nGoal \u2014 to maintain the level at optimum:<\/p>\n<ul>\n<li>Vitamin D: 1000\u20132000 IU\/day (or 10,000 IU twice a week);<\/li>\n<li>Vitamin C: 200\u2013500 mg\/day (can be with food \u2014 for example, 1 orange + \u00bd cup of sauerkraut = ~150 mg);<\/li>\n<li>B-complex: once a day, preferably in the first half of the day (to avoid disrupting sleep).<\/li>\n<\/ul>\n<p><strong>3. Prophylactic phase (seasonal)<\/strong><br \/>\nStart 4 weeks before the change of season:<\/p>\n<ul>\n<li>In autumn: D + C + zinc (15 mg\/day) \u2014 for immune preparation;<\/li>\n<li>In spring: B-complex + magnesium (200\u2013300 mg) + vitamin E (100 IU) \u2014 for restoring the nervous system and antioxidant protection.<\/li>\n<\/ul>\n<p>Important: the intake of vitamins should be **related to food intake**. Fat-soluble (A, D, E, K) \u2014 with fatty foods (olive oil, avocado, fish). Water-soluble (C, B) \u2014 better in the morning, before 2 PM, to avoid interfering with sleep. And never combine vitamin D with calcium without a prescription \u2014 this can lead to hypercalcemia.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%A1%D0%BF%D0%B8%D1%81%D0%BE%D0%BA_%D0%BF%D1%80%D0%B5%D0%BF%D0%B0%D1%80%D0%B0%D1%82%D0%BE%D0%B2_%D0%BA%D0%B0%D0%BA%D0%B8%D0%B5_%D1%84%D0%BE%D1%80%D0%BC%D1%8B_%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE_%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0%D1%8E%D1%82\"><\/span>List of medications: which forms really work<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Not all vitamins are equally absorbed. Here are proven forms, confirmed by clinical studies:<\/p>\n<ul>\n<li><strong>Vitamin D3<\/strong> (cholecalciferol) \u2014 better than D2. Forms: drops in olive oil (for example, \"Devisol\"), capsules with MCT oil (\"D3+K2\" from Now Foods), or tablets with lecithin. Avoid alcohol solutions \u2014 they are poorly absorbed;<\/li>\n<li><strong>Vitamin C<\/strong>: sodium ascorbate (less irritating to the gastrointestinal tract), ascorbyl glucoside (stable form), or liposomal C (high bioavailability, but more expensive);<\/li>\n<li><strong>Folic acid<\/strong>: only in the form <strong>of 5-methyltetrahydrofolate (5-MTHF)<\/&gt;>\n<li><strong>Vitamin B12<\/strong>: methylcobalamin or adenosylcobalamin \u2014 not cyanocobalamin (it contains cyanide in microdoses, and it needs to be detoxified);<\/li>\n<li><strong>Vitamin E<\/strong>: a mixture of tocopherols (alpha-, beta-, gamma-), not just alpha-tocopherol \u2014 this protects cells more effectively.<\/li>\n<p><\/strong><\/li>\n<\/ul>\n<p>An example of a proven complex for autumn:<\/p>\n<ul>\n<li>Vitamin D3 \u2014 2000 IU<\/li>\n<li>Vitamin C \u2014 300 mg<\/li>\n<li>Zinc \u2014 15 mg (in the form of picolinate)<\/li>\n<li>Selenium \u2014 55 mcg<\/li>\n<li>Vitamins B6, B12, folate (in active forms)<\/li>\n<\/ul>\n<p>This composition supports immunity, reduces inflammation, and improves mood \u2014 without excess. And yes \u2014 cheap \"multivitamins\" often contain insufficient doses of D and C, but excess iron and copper, which can exacerbate oxidative stress. Choose based on composition, not price.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%9C%D0%BE%D0%BD%D0%B8%D1%82%D0%BE%D1%80%D0%B8%D0%BD%D0%B3_%D0%B8_%D0%BF%D1%80%D0%BE%D0%B3%D0%BD%D0%BE%D0%B7_%D0%BA%D0%B0%D0%BA_%D0%BD%D0%B5_%C2%AB%D0%BF%D0%B5%D1%80%D0%B5%D0%B3%D0%BD%D1%83%D1%82%D1%8C_%D0%BF%D0%B0%D0%BB%D0%BA%D1%83%C2%BB_%D0%B8_%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0_%D0%B6%D0%B4%D0%B0%D1%82%D1%8C_%D1%80%D0%B5%D0%B7%D1%83%D0%BB%D1%8C%D1%82%D0%B0%D1%82%D0%BE%D0%B2\"><\/span>Monitoring and forecasting: how not to \"overdo it\" and when to expect results<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>After starting vitamin intake, it is important to monitor the effect \u2014 and not just based on how you feel.<br \/>\n<strong>Control deadlines:<\/strong><br \/>\n&lt;ul liIn 4 weeks \u2014 repeat 25(OH)D (if there was a deficiency);<\/p>\n<li>In 8 weeks \u2014 complete blood count, homocysteine (when taking B-complex);<\/li>\n<li>In 12 weeks \u2014 assessment of symptoms: improvement in sleep, energy, skin condition.<\/li>\n<p>The prognosis is favorable with timely correction. In 85% patients, vitamin D levels normalize in 8\u201312 weeks with the correct dosage. But there are nuances:<\/p>\n<ul>\n<li>If the D level does not rise \u2014 check liver and kidney function. An injectable form may be needed;<\/li>\n<li>If fatigue persists \u2014 the deficiency may not be the only factor: check ferritin (iron stores), thyroid (TSH, free T4), and cortisol levels;<\/li>\n<li>With prolonged intake (&gt;6 months) of vitamin A or D \u2014 calcium and phosphates in the blood are mandatory.<\/li>\n<p><\/&gt;\n\u041e\u0441\u043b\u043e\u0436\u043d\u0435\u043d\u0438\u044f><\/p>\n<li>Chronic D deficiency \u2192 osteoporosis, muscle weakness, increased risk of heart attack;<\/li>\n<li>B12 deficiency \u2192 irreversible neurological damage (ataxia, dementia);<\/li>\n<li>Vitamin C deficiency \u2192 scurvy (rare, but occurs in people with an extremely poor diet).<\/li>\n<\/ul>\n<p>But remember: vitamins are not medicines. They do not cure the flu, but make the body more resilient to it. Like a shield \u2014 it does not stop the blow, but reduces the damage.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%92%D0%BE%D0%B7%D1%80%D0%B0%D1%81%D1%82%D0%BD%D1%8B%D0%B5_%D0%BE%D1%81%D0%BE%D0%B1%D0%B5%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D0%BA%D0%B0%D0%BA_%D0%BC%D0%B5%D0%BD%D1%8F%D1%8E%D1%82%D1%81%D1%8F_%D0%BF%D0%BE%D1%82%D1%80%D0%B5%D0%B1%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D1%81_%D0%B3%D0%BE%D0%B4%D0%B0%D0%BC%D0%B8\"><\/span>Age-related features: how needs change over the years<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Children (up to 18 years):<\/p>\n<ul>\n<li>Vitamin D \u2014 600\u20131000 IU\/day (depending on age). Critical for bone growth and immunity;<\/li>\n<li>Vitamin C \u2014 45\u201375 mg (depending on age). Deficiency manifests as frequent sore throats and slow healing;<\/li>\n<li>Important: children absorb vitamins better, but often refuse vegetables \u2014 therefore, forms such as chewable tablets or syrups should be sugar-free and dye-free.<\/li>\n<\/ul>\n<p>Adults (18\u201360 years):<\/p>\n<ul>\n<li>The main focus is on D, B-complex, and antioxidants (C, E, selenium);<\/li>\n<li>Women of reproductive age need more folate (400 mcg) \u2014 especially when planning a pregnancy;<\/li>\n<li>Men need zinc and selenium to support reproductive function.<\/li>\n<\/ul>\n<p>Elderly (over 60):<\/p>\n<ul>\n<li>Decreased gastric juice secretion \u2192 poor absorption of B12. Requires either injections or sublingual forms;<\/li>\n<li>Decreased synthesis of vitamin D in the skin \u2014 by 75% compared to youth. Therefore, the dose of D should be higher (80\u20132000 IU);<\/li>\n<li>Risk of K2 deficiency \u2014 leads to calcium deposition in blood vessels. Therefore, the D3+K2 complex is the optimal choice.<\/li>\n<\/ul>\n<p>Interesting point: in people over 70, the level of vitamin B6 in the blood is often elevated not due to excess, but due to metabolic disorders \u2014 and this also requires correction. Therefore, age is not just a number, but a parameter that changes the entire support strategy.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D0%92%D0%BE%D0%BF%D1%80%D0%BE%D1%81%D1%8B_%D0%B8_%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D1%8B_%D1%81%D0%B0%D0%BC%D1%8B%D0%B5_%D1%87%D0%B0%D1%81%D1%82%D1%8B%D0%B5_%D0%B7%D0%B0%D0%BF%D1%80%D0%BE%D1%81%D1%8B_%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D0%B5%D0%B9\"><\/span>Questions and answers: the most frequent user inquiries<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Question 1: Can I take vitamin D in the summer if there is no deficiency?<\/strong><br \/>\nYes, but wisely. If the level of 25(OH)D is above 40 ng\/ml \u2014 additional intake is not needed. Excess D is not excreted like water-soluble vitamins and can accumulate. It is better to take a test in June \u2014 and if everything is normal, limit yourself to sunbathing (15\u201320 min a day, without sunscreen, on hands and face). But in August \u2014 start prevention: from September, synthesis drops sharply.<br \/>\n<strong>Question 2: Why do I take vitamin C but still get sick often?<\/strong><br \/>\nVitamin C is not an immune stimulant, but an antioxidant and cofactor for collagen and interferon synthesis. Its deficiency reduces protection, but excess does not make you \"immune.\" Frequent ARVI may be related to D, zinc deficiency, or microbiome disruption. Check levels of D and selenium \u2014 they work in conjunction with C.<br \/>\n<strong>Question 3: Which vitamin helps with autumn depression?<\/strong><br \/>\nNot one. Seasonal affective disorder (SAD) is associated with a disruption in the synthesis of serotonin and melatonin. Key participants:<\/p>\n<ul>\n<li>Vitamin D \u2014 regulates serotonin receptors;<\/li>\n<li>Vitamin B6 \u2014 necessary for converting tryptophan into serotonin;<\/li>\n<li>Magnesium \u2014 stabilizes the nervous system;<\/li>\n<li>Omega-3 (EPA+DHA) \u2014 improve the fluidity of cell membranes in the brain.<\/li>\n<\/ul>\n<p>Comprehensive support yields results faster than a single vitamin.<br \/>\n<strong>Question 4: Can vitamins be replaced by food?<\/strong><br \/>\nYes \u2014 but only with a varied diet. For example:<\/p>\n<ul>\n<li>Vitamin D: 100 g of cod liver = 3000 IU, 1 egg (yolk) = 40 IU, 100 g of salmon = 500 IU;<\/li>\n<li>Vitamin C: 1 orange = 70 mg, 100 g of sauerkraut = 20 mg, 1 chili pepper = 240 mg;<\/li>\n<li>Vitamin B12: 100 g of beef liver = 60 mcg (100 times the daily norm!).<\/li>\n<\/ul>\n<p>But in urban conditions, where fresh products are expensive and not always of good quality, dietary supplements are a rational addition, not a replacement.<br \/>\n2&gt;Typical mistakes and how to avoid them<br \/>\n<strong>Mistake 1: \u201cI take vitamins, so I can eat anything\u201d**<br \/>\nNo. Vitamins do not compensate for a deficiency of protein, fats, or fiber. Without proper nutrition, supplements work 30\u201350% less effectively. Example: vitamin D without fat \u2014 will not be absorbed. Vitamin C with coffee \u2014 will be excreted faster.<br \/>\n<\/strong><strong>Mistake 2: Taking all vitamins in the morning \u201con an empty stomach\u201d**<br \/>\nFat-soluble vitamins (A, D, E, K) on an empty stomach \u2014 are almost not absorbed. Water-soluble (C, B) \u2014 can irritate the mucosa. Better: B-complex \u2014 with breakfast, D \u2014 with lunch (with fatty food), C \u2014 between meals.<br \/>\n<\/strong><strong>Mistake 3: Prolonged intake of the same complex without control**<br \/>\nThe body adapts. After 3\u20134 months, effectiveness decreases. Rotation is needed: for example, in autumn \u2014 D+C+zinc, in winter \u2014 B-complex+magnesium, in spring \u2014 antioxidants (E, selenium, quercetin).<br \/>\n<\/strong><strong>Mistake 4: Ignoring interactions**<br \/>\nVitamin E reduces the effectiveness of vitamin K (risk of bleeding). Zinc in large doses blocks the absorption of copper. Iron reduces the absorption of zinc and calcium. Therefore \u2014 read the composition, and do not mix dietary supplements without consultation.<br \/>\nWhat to do instead:<\/p>\n<ul>\n<li>Take tests twice a year \u2014 in autumn and spring;<\/li>\n<li>Choose forms with proven bioavailability;<\/li>\n<li>Combine intake with sleep, light, and movement \u2014 vitamins work in a system, not in isolation.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"%D0%98%D1%82%D0%BE%D0%B3_%D1%81%D0%B5%D0%B7%D0%BE%D0%BD_%E2%80%94_%D0%BD%D0%B5_%D0%B2%D1%80%D0%B0%D0%B3_%D0%B0_%D1%81%D0%B8%D0%B3%D0%BD%D0%B0%D0%BB_%D0%B4%D0%BB%D1%8F_%D0%B7%D0%B0%D0%B1%D0%BE%D1%82%D1%8B_%D0%BE_%D1%81%D0%B5%D0%B1%D0%B5\"><\/span>Conclusion: the season is not an enemy, but a signal to take care of yourself.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Autumn and spring are not a reason for panic, but a natural cycle that our body knows how to overcome. But only if we provide it with the necessary tools. Vitamins are not \"magic pills,\" but biochemical keys that trigger recovery, protection, and adaptation processes. The main thing is to act consciously: know your level, understand which forms work, and not confuse prevention with treatment.<br \/>\nIf your task is to prepare for the season \u2014 start with a 25(OH)D test and a general blood test. Then \u2014 choose support based on your age, lifestyle, and genetics. And remember: the best prevention is not what you take, but how you live. Light, movement, sleep, and a varied diet are the foundation. Vitamins are just an enhancer of this foundation.<br \/>\nYou are not a \"superhuman\" in autumn. You can be healthy \u2014 simply because you know how to help your body. And yes \u2014 if in doubt, consult a doctor. Not a \"social media expert,\" but someone who sees your tests and listens to your story. Because your body is unique. And it deserves precise, not template support.<\/strong><\/p>\n<div class=\"fpm_end\"><\/div>","protected":false},"excerpt":{"rendered":"<p>The autumn wind is already rustling in the foliage, and spring \u2014 unexpectedly \u2014 bursts in with the first thaw and a sharp temperature drop. And each<\/p>","protected":false},"author":1,"featured_media":24313,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[298],"tags":[],"class_list":["post-17881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medlibrary"],"_links":{"self":[{"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/posts\/17881","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/comments?post=17881"}],"version-history":[{"count":4,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/posts\/17881\/revisions"}],"predecessor-version":[{"id":18932,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/posts\/17881\/revisions\/18932"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/media\/24313"}],"wp:attachment":[{"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/media?parent=17881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/categories?post=17881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/valintermed.com\/en\/wp-json\/wp\/v2\/tags?post=17881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}