Vitamin D

Everything you need to know about Vitamin D: The Sun in a Capsule

Vitamin D has long been in the spotlight of the orthomolecular world because of its important role in our health. Although it is not technically a true vitamin because it can be produced by the body under the influence of sunlight, it appears to be crucial for many bodily functions. Here's everything you need to know about vitamin D, from sources and deficiencies to recommended dosages and drug interactions.

Sources and Production

Vitamin D can be produced in the skin between May and October under the influence of UV-B radiation from sunlight. This means that daily sun exposure between 11 a.m. and 3 p.m. for at least 15 to 30 minutes is necessary. However, for some it is difficult to get enough sunlight, especially in the winter months or for people with dark skin tones, who cover their bodies or use sunscreen. Therefore, nutritional supplements are often necessary to maintain adequate vitamin D status.

Important Features

Vitamin D has a wide range of functions in the body, including:

• Support strong bones and teeth by promoting calcium absorption.
• Maintenance of flexible muscles and a healthy balance.
• Strengthening the immune system and increased resistance to infections.
• Positive influence on cardiovascular health and blood pressure regulation.
• Supporting intestinal health and barrier function.
• Important for fertility, nervous system, mental health and cell regeneration.
• Possible slowdown of aging processes.

Sources and Signs of Deficiency

Vitamin D is found in foods such as oily fish, eggs and fortified dairy products, but it is difficult to get enough of it through diet alone. Signs of a possible deficiency include muscle weakness, fatigue, bone and muscle pain, reduced resistance to infections and an increased risk of several health problems, including cardiovascular disease, autoimmune diseases and depression.

Recommended Dosages and Safety

The Health Council has set dietary reference values ​​for vitamin D, but international experts believe that higher doses are needed to achieve optimal levels. A daily dose of 25-75 mcg is recommended for most adults, although some may need more, especially the elderly, those who are overweight or have certain health conditions. Dosages up to 100 mcg per day are generally considered safe, but higher doses should be taken under expert supervision.

Interactions and Safety

A high dose of vitamin D is contraindicated in case of high blood levels of calcium or phosphorus, hyperparathyroidism and kidney stones. Be careful with high doses of vitamin D in sarcoidosis; the conversion of vitamin D into calcitriol has increased, which increases the risk of hypercalcemia.

Conclusion

Vitamin D is an essential nutrient with a wide range of health benefits. It is important to get enough vitamin D, either through sunlight exposure or through dietary supplements, especially for people who have difficulty getting enough sunlight or who are at increased risk of deficiency. Always consult a doctor before starting to take vitamin D supplements, especially if you are taking other medications.