Research
Hormonal
Tribulus Terrestris supplementation does not improve muscle strength, body composition, or testosterone levels in trained individuals, despite marketing claims to the contrary.
Do not take Tribulus Terrestris expecting it to increase your testosterone or muscle strength. Research shows it has no effect on these metrics in trained individuals. It is likely a waste of money, though it may have a placebo effect.
GoodRefutesHIGH confidence
Other studies have shown that TT supplementation (3.2 mg/kg body mass) has no effects on body composition and maximal strength (5-weeks: 450 mg of a TTE) [77], muscular endurance in resistance-trained men [7], testosterone levels in response to short period (5 day: 750 mg/day) or moderate long period (4-weeks: 10 or 20 mg/kg body mass) [78] [79] in trained individuals.
Why this rating
Multiple studies cited consistently show no effect on the claimed outcomes in trained populations.
Source
Herbal medicine for sports: a review
Maha Sellami et al. · Journal of the International Society of Sports Nutrition · 2018
DOI 10.1186/s12970-018-0218-y
narrative_reviewCited 174×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Caffeine supplementation (2-9 mg/kg) taken 1 hour prior to exercise significantly improves both endurance and anaerobic performance by stimulating the central nervous system and increasing serum catecholamines.Good
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- Green Tea Extract (GTE) supplementation increases 24-hour energy expenditure and fat utilization in active individuals, but does not consistently improve sprint performance or antioxidant enzyme levels in trained sprinters.Moderate
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