Source: Examine.com — Tribulus terrestris — Controlled trials consistently show no testosterone increase in healthy men; ~750 mg is a common dose, mostly studied for libido.
Consistently fails to raise testosterone in controlled trials — a 'T-booster' built on tribulus is on weak ground no matter the dose.
A vine extract that's been a testosterone-booster staple for decades — despite the evidence.
Contains saponins (protodioscin) proposed to raise luteinizing hormone, but controlled trials don't show a testosterone increase in healthy men.
Generally safe; occasional GI upset. The issue is efficacy, not safety — it's the classic example of a popular ingredient that doesn't do what the label implies.
| Per serving | |
|---|---|
| Typical branded single-ingredient product | $0.33 |
| Bulk powder at the clinical dose (250g 45% saponins, $25.97) | $0.08 |
Buying bulk powder instead of a branded bottle saves about 77% per serving.
Bulk price: $25.97/250g →Educational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-21. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.