Why is vitamin D so important, especially in Germany?
Vitamin D regulates the immune system, inflammation, energy levels, muscles, and mood. A deficiency often weakens the body unnoticed. In Germany, due to low sun intensity, the skin can barely produce any vitamin D for many months of the year. Office work, clothing, and sunscreen exacerbate the problem. Therefore, many people have insufficient vitamin D levels despite a "healthy lifestyle"; testing is crucial .