Tongkat Ali supplement forms studied in human research
The strongest current support is for testosterone Free Testosterone Male Hormones. Other uses on this page have narrower, weaker, or not-yet-clear evidence.
What the research says
Each row is a different health effect. A means the support looks strongest, B likely helpful, C mixed or modest, and — not enough human evidence yet.
Papers are individual studies. Research reviews summarize evidence from multiple studies, such as systematic reviews and meta-analyses.
B · Likely helpful
B
Testosterone Free Testosterone Male Hormones
The research suggests this may help with testosterone Free Testosterone Male Hormones in the studied settings. Broader claims would go beyond the evidence shown here.
6 papers · 1 research review
— · Not enough human evidence yet
—
Exercise Performance Strength Body Composition
Research has been reviewed for exercise Performance Strength Body Composition, but the current human evidence is still too limited or inconsistent for a confident benefit claim.
2 papers
—
Libido Sexual Function Erectile Function
Research has been reviewed for libido Sexual Function Erectile Function, but the current human evidence is still too limited or inconsistent for a confident benefit claim.
1 paper
Safety
Safety is graded separately from benefits. Even with a favorable safety label, these notes still matter if you take medication, are pregnant, or have a medical condition.
✓ SafeNo clear harm signal in the human evidence reviewed.
✓
Liver Kidney Toxicity Markers
This is a safety note, not a benefit claim. It should not be read as a green light for every person or situation.
1 direct human study
✓
Side effects and tolerability
This is a safety note, not a benefit claim. It should not be read as a green light for every person or situation.
1 direct human study
Quick facts
A quick read on what this page supports right now.
Health effects reviewed
3 health effects reviewed
Best grade shown
B · Likely helpful
Benefits with support
1 use currently shows some level of supportive evidence
Safety rows
2 separate safety or caution rows
Research volume
6 unique research papers across graded uses on this page
What this means
Keep any benefit claims limited to the specific graded uses shown here.
Quality-verified products
Products that pass third-party quality testing.
Product quality data coming soon
Any future product listings should stay aligned with the specific graded outcomes and the separate safety rows shown here.
How we graded Tongkat Ali
This page shows the current public rows for Tongkat Ali:
6 unique research papers across
3 visible health effects. Safety rows are shown separately from benefit rows when available. The page includes
1 review-level paper and
8 direct human studies. Each supplement is graded by health effect using a certainty × effect matrix applied across PubMed evidence per health effect. Cochrane reviews and high-quality systematic reviews carry the most weight. See
Methodology
for full detail.