Hardly any nutrient is researched as intensively as vitamin D. Its interplay with the immune system in particular is repeatedly the focus of scientific studies. In this article we look at what vitamin D actually is, what role it plays in the body and how you can keep an eye on your levels in everyday life.
What is vitamin D anyway?
Vitamin D holds a special position among vitamins: the body can produce it itself in the skin with the help of sunlight. Strictly speaking, it behaves more like a hormone, because it is converted into an active form in the body and acts on numerous cells. It is precisely this broad effect that makes it so interesting for research.
The connection to the immune system
One fascinating area of research is the connection between vitamin D and immune function. Many immune cells have so-called vitamin D receptors – docking points through which vitamin D can influence their activity. Studies suggest that vitamin D plays a role in regulating immune processes.
A balanced understanding is important here: vitamin D is not a shield that prevents illness. Rather, research assumes that an adequate vitamin D status is part of a well-functioning overall system – together with many other factors.
Why deficiency is so common
In many regions of Europe a low vitamin D level is widespread, especially in the darker months. There are several reasons for this:
- Geographical location: In northern latitudes the sunlight in winter is often not sufficient.
- Lifestyle: A lot of time indoors means less direct skin contact with sunlight.
- Sun protection: Sensible UV protection simultaneously reduces the body's own production.
- Diet: Only a few foods contain notable amounts of vitamin D.
- Age and skin type: Both can influence self-production.
How you can support your vitamin D status
Sunlight
The most natural way is moderate sunlight. Even regular time spent outdoors can stimulate the body's own production – always with care, of course, and without overexposing the skin.
Diet
Oily fish, eggs and fortified foods provide vitamin D. In practice, however, diet alone is often not enough to fully cover the requirement.
Supplements
Especially in the winter months, many people turn to vitamin D preparations. If you are considering supplementation, you will find a suitable selection in our Protection & Resilience category. Supplementation makes the most sense when your individual requirement is known.
Knowing your own level
Since both a deficiency and an overdose can be unfavourable, it makes sense to know your own vitamin D value. A simple blood test provides information about where you stand. On this basis, you can decide together with a medical professional whether and in what amount supplementation is sensible. Studies suggest that a balanced status is the most favourable in the long term – neither too low nor unnecessarily high.
Note: This article is for informational purposes only and does not constitute medical advice. It is not a substitute for a conversation with a doctor. Before taking higher-dose preparations, please speak with a medical professional.
