the process of spermatogenesis, increase libido and assist the functioning of the urinary tract. Learn how it works and what is its effectiveness. - action and side effects of the supplement. Is is effective? is one of many supplements on the market designed to improve sexual performance. It comes in several versions: basic, enhanced ( King , contains 2 times more L-arginine), accelerated action ( Go!) And in the version which further improves libido (sex Appetite). The main component of each formulation is an extract of Tribulus terrestris, which is considered a natural aphrodisiac. Tablets, depending on .