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Tribosten Protodioxcin Delivery System has taken over as the world's #1 Tribulus terrestris product. ThermoLife International's research and development team has worked directly with the first and only American scientists to separate pure protodioscin from the Tribulus terrestris plant. 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 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.