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Vitamin D is far more than a vitamin. It is an essential prohormone that controls numerous vital functions in the body. It does not only affect bone health; it also plays a decisive role for the immune system, muscle function and even brain health. An optimal vitamin D level is associated with a lower risk of cardiovascular disease, autoimmune disease and certain cancers.

The problem: at our latitudes, enough vitamin D from sunlight is often not guaranteed, especially in winter. Many people therefore have a deficiency without knowing it, which can go along with fatigue, susceptibility to infection, muscle pain or even depression.

This article shows you why vitamin D is indispensable for your health, how to recognise a deficiency, and what you can do to bring your values into an optimal range.