Die Bedeutung von Vitamin D

The importance of vitamin D

Jun 28, 2023Robert Barabas-Steiner

Vitamin D is a fat-soluble vitamin that has a variety of functions in the body. Here is some important information about vitamin D:

Functions of vitamin D

01 Immune function

Vitamin D has an immunomodulatory effect and plays a role in regulating the immune system. It can improve the function of immune cells and influence inflammatory reactions.

02 Bone health

Vitamin D is important for normal bone formation and mineralization. Vitamin D deficiency can lead to bone diseases such as rickets in children and osteomalacia in adults.

03 Muscle health

Vitamin D is also important for muscle health. It supports muscle function and can reduce the risk of muscle cramps and weakness.

04 Calcium and phosphate metabolism

Vitamin D plays a crucial role in the absorption of calcium and phosphate from food in the intestine. It promotes the absorption of these minerals into the bones and thus supports bone health.

Sources of Vitamin D

01 Sunlight

The main source of vitamin D is the body's own production through exposure of the skin to UVB radiation. When sunlight hits exposed skin, vitamin D is synthesized in the skin. Production depends on factors such as latitude, season, time of day, skin color, and use of sunscreen.

02 Food

Although few foods naturally contain vitamin D, some fish such as salmon, mackerel and herring can be a good source. Egg yolks, liver and fortified foods such as dairy products, juices and cereal products also contain vitamin D.

03 Dietary supplements

Vitamin D supplements are available in the form of pills or liquid supplements and can be taken as directed by a doctor to ensure the body is adequately supplied.

Effects of vitamin D deficiency

01 Rickets

Severe vitamin D deficiency in children can lead to rickets, a bone disease that can cause bone deformity, stunted growth, and muscle weakness.

02 Osteomalacia

In adults, vitamin D deficiency can lead to osteomalacia, a condition in which bones become soft and weak due to impaired mineralization.

03 Osteoporosis

Chronic vitamin D deficiency can increase the risk of osteoporosis, a condition in which bone mass decreases and the risk of bone fractures increases.

04 Impaired immune function

A lack of vitamin D can impair the immune system and increase the risk of infections and autoimmune diseases.


It is important to maintain adequate vitamin D levels. If you suspect you have a vitamin D deficiency or to determine your individual needs, you should consult a doctor.

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