According to various studies and research, herbal medicines such as tongkat ali have demonstrated potential in increasing testosterone levels and enhancing sexual function and fertility. In a study of men with ADAM, the combination of Eurycoma longifolia and concurrent training showed improvements in erectile function and total testosterone levels. Furthermore, clinical trials have shown that tongkat ali can significantly increase both total and free testosterone levels in both men and women. Other studies have also shown a decrease in stress hormones with the use of tongkat ali. However, it should be noted that increased testosterone levels may lead to hair loss and prostate enlargement in men and women, respectively.