Tribulus Terrestris is an herb with a long history of use in Ayurvedic medicine which has become popular in recent years as a supplement for male health and testosterone support, as well as for cardiovascular health. The main ingredient in Tribulus which contributes to its testosterone and libido support benefits are known as saponins. Double Wood’s Tribulus supplement is one of the most potent on the market and is standardized to 95% saponins. (The average saponin concentration of competing Tribulus supplements is just 45% or less.)