D and levels. It was found that a vitamin D supplement could boost the production of in the cells of the testes. This is due to the fact that the glands secreting this hormone are endowed with vitamin D receptor! Young muscular man doing intense workout at the fitness room. Conclusion: There are therefore natural ways to increase the level of Strength Muscles. Regular training is one of the most effective methods to take advantage of the beneficial effects of this hormone of manhood, such as better sports performance but also under the quilt. A study by the Harvard School of Public Health in the United States of 30,000 subjects found that men who trained regularly had a 30 per cent chance of suffering from impotence compared with those who did not play any sport. Although lowering levels is a.