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Vitamin D - All you need to know

In the following, we will tell you everything you need to know about vitamin D. We explain vitamin D's benefits, how much vitamin D you should generally take, and other topics. Did you know that vitamin D contributes to the normal function of your immune system?

What is vitamin D?

Vitamin D belongs to the fat-soluble vitamins and can be formed by the human body itself, but it can also be absorbed through food. However, diet only has a small influence (about 10-20%) on vitamin D levels in the body.

Why is vitamin D actually important for the body?

Vitamin D contributes, among other things, to the normal function of the immune system, plays a crucial role in cell division and is important for muscle function, bones and teeth. Above all, vitamin D regulates the absorption of calcium in the intestine, which is ultimately important for bone mineralisation.

What are the benefits of taking vitamin D?

As already mentioned, vitamin D can be synthesised by humans themselves. This synthesis takes place in the skin and depends on the UV radiation of the sun. Both the dose of UV radiation and the synthesis depend on many factors, such as geographical latitude, weather, season, skin type, clothing, and cosmetic treatment of the skin.

What foods contain vitamin D?

Everyone can absorb vitamin D through their diet. It is one of the fat-soluble vitamins and is mainly found in foods of animal origin (e.g. salmon, tuna, herring). But vitamin D3 is also found in low concentrations in food products such as milk, dairy, or egg yolk. Vitamin D can also be found in plant foods such as mushrooms. However, this is vitamin D2

Our Hey Sunshine Sun Vitamins and One Bear A Day Vitamins also contain vitamin D.


"Vitamin D is not only important for the immune system but plays an important role for our bones and muscles. That's why a good supply of vitamin D is essential for our bodies."

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Study on the importance of vitamin D

We provide the following scientific studies for your general information. The results obtained in these studies do not necessarily apply to all individuals. Feel free to click on the corresponding links to get more detailed information.

Immunological effects of vitamin D on health and disease.

An association has been observed between low serum 25-hydroxyvitamin D levels and an increased risk of developing various immunological diseases and disorders such as psoriasis, type 1 diabetes, multiple sclerosis, rheumatoid arthritis, tuberculosis, sepsis, respiratory infections, and COVID-19. Accordingly, a number of clinical trials have been conducted with varying results.