Tongkat ali (Eurycoma longifolia)
Longjack, Long Jack, Pasak bumi
Forms: Water extracts of the root, often standardized to eurycomanone; also crude root powder and 'male enhancement' blends.
A Southeast Asian root sold as a natural testosterone and libido booster. Small trials show modest testosterone rises, mainly in men with low levels.
Legal status: Sold as a supplement in the US and Southeast Asia; lacks EU food authorization after EFSA's negative 2021 safety opinion; varies by country.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used for libido, mood and testosterone support, sometimes after stopping steroids. A meta-analysis found higher testosterone mainly in hypogonadal men; trials are small, and nothing shows it restores natural production after steroids.
What people seek and what studies show
In a 2022 meta-analysis of 5 small trials, total testosterone rose clearly in men with low levels, but not significantly in men with normal levels; results varied widely, with signs of publication bias, and most studies tested one commercial extract. A small trial in stressed adults found less tension and lower cortisol. Pooled erection data showed no overall effect; only men with worse baseline scores improved.
Effects
Evidence: Limited human data — some human studies, small or short
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
2 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
General ways to lower the chance of each side effect. No measure removes a risk completely.
What is unknown cannot be lowered, only avoided; tell your doctor what you have taken.
Products obtained without a prescription are often fake, mislabeled or non-sterile, and there is no way to check at home. For legal supplements, look for third-party testing (Informed Sport, NSF).
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
Myth & fact
“Is tongkat ali a natural alternative to steroids?”
No. Testosterone rose modestly, mainly in men with low levels; there is no steroid-like anabolic effect and no proof it aids hormonal recovery after steroids.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check