A vine whose steroidal saponins are traditionally linked with libido and drive.
Tribulus Terrestris is a flowering vine whose steroidal saponins, chiefly protodioscin, are why it appears in almost every men's vitality formula on the market.
The trial evidence for Tribulus is generally stronger for libido than for a measurable rise in testosterone — a distinction worth knowing before you buy.
Primordial Vigor X includes Tribulus as one of its three lead botanicals, alongside Tongkat Ali and Saw Palmetto.