Tribulus is an excellent supplement to take at the end of a prohormone cycle to help kick start your own testosterone production again. And it can also be effectively used to increase strength gains and aid in helping you get over a plateau. for optimal results try to find a tribulus supplement that is standardized for 45% saponis. And with specific regard to sexual function: In men: increase libido, in potency and strength of erections, in the number and quality of sperm produced, and often, testosterone In women: increases libido, improved sex hormone profile (increases in estradiol levels), mood and ovulation effects, and reductions in some menopausal symptoms