Tribulus Terrestris
Also known as: Tribulus, TT, Puncture Vine, Gokshura
Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
A herbal extract marketed as a testosterone booster. A 2025 systematic review found no robust evidence that it raises testosterone, with 8 of 10 studies reporting no significant change in androgen profile. It does not raise the natural ceiling. Rated 1 (basically natty).
Overview
One of the oldest and most persistent "natural test booster" ingredients, still found in a large share of testosterone support products. The systematic review evidence does not support the testosterone claim. It is included here so that anyone considering it can see what the trials actually found rather than what the label says.
Important Warnings
- •No robust evidence for raising testosterone: 8 of 10 studies in a 2025 systematic review found no androgen change
- •Half the studies in that review were of low methodological quality
- •Not a PCT compound and no substitute for SERMs or hCG after suppression
- •Product standardization varies enormously between brands
- •Marketed testosterone claims are not supported by the trial literature
Purpose & Use Cases
Marketed As A Testosterone Booster
The dominant marketed claim, and the one the systematic review evidence does not support. Eight out of ten studies reported no significant change in androgen profile.
Erectile Function And Libido
The more defensible claim, though still weak: the systematic review characterised the evidence for improving erectile function in men with erectile dysfunction as low-level, not absent.
Benefits
- Some evidence, rated low-level, for improving erectile function in men with erectile dysfunction
- Well tolerated with a mild side-effect profile
- Widely available and inexpensive
- Causes no hormonal suppression and requires no PCT
Good to Know
What the systematic review actually found
A 2025 systematic review in Nutrients screened 162 studies, read 52 in full and included 10 (9 clinical trials plus 1 quasi-experimental study). Eight of the ten reported no significant change in androgen profile following supplementation, and the review concluded there was no robust evidence for increasing testosterone levels. It also noted low methodological quality in half the included studies.
Baseline matters, and most users are not deficient
The review noted that subjects in the neutral studies did not have low androgen levels at baseline. A supplement that does nothing in men with normal testosterone is precisely the situation most people buying it are in.
The libido claim is not the testosterone claim
Some users report improved libido, and there is low-level evidence for erectile function. That is not the same as raising testosterone, and it is the testosterone claim that sells the product. Conflating the two is the core marketing move here.
Not a PCT compound
Tribulus appears in post-cycle products. There is no evidence it restores a suppressed HPT axis. That job belongs to SERMs and hCG: using tribulus instead means running no real PCT at all.
Dosage Guidelines
| Experience Level | Dosage Range |
|---|---|
| Beginner | 250 – 750 mg/day |
| Intermediate | 750 – 1500 mg/day |
These figures reflect common supplement labelling rather than a validated protocol, no dose has been established as effective for raising testosterone, because the systematic review evidence does not support that effect at any dose. Standardization varies enormously between products (saponin percentage and plant part used both differ), which is one reason the trial literature is inconsistent and hard to compare. The systematic review also noted that half the included studies were of low methodological quality by Jadad score.
Pharmacokinetics are not meaningfully established, and "tribulus" covers preparations that differ substantially in saponin content and plant part used, a major reason the trial literature is inconsistent.
Side Effects
Mild gastrointestinal upset
uncommonStomach discomfort or cramping, generally mild.
Take with food.
Product variability
commonSaponin standardization and plant part vary widely between products, so two supplements at the same milligram dose can differ substantially in content.
Choose products stating standardized saponin content with third-party testing.
General Mitigation Strategies
Tribulus is benign. The issue is not safety but efficacy. The realistic cost of taking it is money spent and the belief that a testosterone problem is being addressed when it is not.
Post Cycle Therapy (PCT)
Causes no suppression and needs no PCT. It should also not be used AS a PCT. There is no evidence it recovers a suppressed axis.
How It Works
Tribulus contains steroidal saponins, principally protodioscin, which have been proposed to increase luteinizing hormone and thereby testosterone. That proposed mechanism has not been borne out in the human trial literature. Effects on erectile function, where any signal exists, appear more likely to be mediated by nitric oxide pathways than by androgen elevation.
Hormonal & Androgenic Profile
N/A: a herbal extract, not an androgen.
Not an aromatase or estrogen tool.
No documented cardiovascular effect.
Fundamentals
Reference on the practices relevant to Tribulus Terrestris: how they are done and where they go wrong. Not a recommendation to use it.
Common Stacks
- Realistically: not worth including for testosterone purposes
- If libido is the actual goal, compounds with real evidence exist (tadalafil, PT-141)
- Never use in place of a genuine SERM-based PCT
Legal Status
Sold freely as a dietary supplement. Not an approved medicine for any indication.
Legal status varies by country and changes over time. This is a general summary, not legal advice.
WADA Status
A herbal supplement not listed on the WADA Prohibited List.