Vitamin D – Latest Studies 05.2026
Updated: Aug 15
Vitamin D is a fat-soluble micronutrient that also acts like a hormone precursor in the body. Part of it can be produced in the skin when UVB rays from sunlight are available. Only a few foods naturally contain meaningful amounts of vitamin D, including fatty fish, egg yolk, liver and fortified foods.
It is best known for its role in calcium metabolism, bones, teeth and muscle function. It is also connected to immune function, inflammation regulation, mood and metabolic processes. This makes vitamin D more than just a simple “sunshine vitamin” topic. New data show:
Vitamin D, mood, and cardiometabolic markers: A double-blind randomized study with 224 adults with major depression investigated 50,000 IU vitamin D per week over six months. The vitamin D group showed higher serum levels, clearly reduced depressive symptoms and suicide risk, and improvements in several cardiovascular risk factors, including lipid profile, blood glucose control, and inflammatory markers.
Vitamin D and early multiple sclerosis: The D-Lay MS study investigated high-dose oral cholecalciferol in clinically isolated syndrome and early relapsing-remitting multiple sclerosis. 100,000 IU every two weeks significantly reduced disease activity and makes vitamin D a highly interesting research area in this field.
Conclusion: The current state of research up to May 2026 shows vitamin D as a micronutrient with strong potential, especially at low baseline levels. The most interesting areas right now are mood, inflammation regulation, autoimmunity, metabolism, and targeted supply when low levels are present. (Important: Please clarify the intake and dosage with your healthcare professional)
01.05.2026
Author: Alireza Mohtashami
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About the AuthorAlireza Mohtashami is the author of "Plant-Eater's Helper", a certified mushroom expert of the German Mycological Society and a trained practitioner of herbal medicine. He continuously reviews current studies on nutrition, nature and holistic health and presents them in a practical way, free of ideology. More about the author
The Book on This Topic"Plant-Eater's Helper" is the guide to plant-based nutrition: critical nutrients and antinutrients, protein requirements and plant-based sources, and bioavailability through sprouting, soaking, cooking and fermenting. Plus practical chapters on sport, pregnancy and highly processed foods. Currently available in German only; an English edition is in preparation. All about the bookReading sample (PDF) · Autorenwelt · Amazon · Romeon Verlag · Thalia
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