For men, DAA, in addition to increasing testosterone levels and thus muscle growth, is very important in sperm formation. One study has shown that d-aspartic acid is present in the process of spermatogenesis, i.e. sperm formation. It also affects their quality and improves reproduction in men. In addition, by increasing testosterone, it acts as a sexual stimulant and increases sexual desire.   For women, d-aspartic acid may play an important role in sexual life and reproduction. The study found that DAA was found to be a physiological component in a follicular fluid that decreases with age and affects the reproductive potential of women. It can therefore have a positive effect on women during menopause but also at working age, promoting reproductive potential and increasing libido. However, for women, the use of DAA should be consulted with a specialist or physician.