D-Vita 100 µg for bones, muscles and resistance! A strong Vitamin D supplement may be necessary in the dark winter time. As a vitamin D preparation, the D3 form is recommended, becuase it is natural and effective for humans. Vitamin D promotes the normal absorption and utilization of calcium and phosphorus, which is a prerequisite for the normal condition of bones and teeth. Muscle function also requires vitamin D. In autumn and winter, immunity needs strengthening with vitamin D, because it benefits the normal functioning of our defense system. A nutritional supplement does not replace a varied and balanced diet or a healthy lifestyle.