2/5
Weak
evidence
Testosterone booster evidence brief
Tribulus terrestris
Popular testosterone-booster marketing is not matched by convincing sport-performance or body-composition evidence.
Headline Finding
CrossFit/rugby trials: no meaningful testosterone, body-composition, or performance benefit.
Dose Context
Saponin content and extract quality vary widely across products.
Important Caveat
Libido or biomarker claims do not convert into strength, testosterone, or muscle-gain evidence.
Source Drawer
Linked Research
- Systematic review Sport biomarkers systematic review
- Systematic review Clinical trials systematic review
- Trial CrossFit performance RCT
- Trial CrossFit biomarker RCT
- Trial Rugby athlete trial
How To Read This Rating
The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
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