Optimum Nutrition Tribulus, 625 mg
Tribulus terrestris extracts can lay claim to being one of the very few legitimate testosterone support nutrients, but it's getting harder and harder to find a good tribulus-only supplement. Brands can't seem to resist adding other ingredients that will justify a higher price tag and profits than what they'd see from a tribulus only products. Many of these expensive and aggressively marketed test boosters are in fact little more than glorified "tribulus, etc." formulas.
So a tribulus-only test booster is the way to go for a lot of users who get great results and save money when they use a good one. Tribulus 625 from Optimum Nutrition would be a great choice and is a steady-bestseller since it's from an trusted brand and the specs are right where most tribulus users want them, a 40% tribulus extract in 625 mg capsules.