Tribulus Terrestris P.E is a potent compound extracted from the small, naturally occurring, leafy plant Tribulus terrestris. Saponin is one of its active ingredients. The roots and fruits of this plant are used as medicinal herbs in traditional Chinese medicine and Ayurvedic medicine in India. Studies have shown that Tribulus terrestris is widely used as a dietary supplement for its ability to lower blood sugar levels, prevent blood vessel damage and prevent increases in blood cholesterol.