Previously, this technology was only known to a handful of Bulgarian scientists who kept this secret under lock and key. This new technology has enabled ThermoLife International to produce Tribosten, a superior Tribulus terrestris product with a higher percentage of protodioscin than anything else ever available before. This is important because protodioscin is the active ingredient in Tribulus terrestris. This combined with Bioperine, a patented extract for increasing bio-availability of oral supplements guarantees you the finest Tribulus product your money can buy and the only Protodioscin Delivery System available.