02
What Is It?
A root extract sold for libido, energy and testosterone support.
Product Profile & Review
SUPPLEMENT
Tongkat Ali
A Southeast Asian root marketed for testosterone and libido, with small, mixed studies.
Also known as: Eurycoma longifolia, Longjack
- Written by
- SynMale Editorial
- Originally Published
- October 2026
- Last Updated
- October 2026
- Medical Review
- Not yet independently reviewed
Executive Summary
- What is it?
- Herbal dietary supplement (Supplement).
- What does it contain or claim to contain?
- Eurycoma longifolia extract (claimed)
- How well verified is this specific product?
- Label Claims Only
- Most important thing to know
- Small, mixed studies on libido and testosterone; it does not work like ED medications.
C
Ingredient
Eurycoma longifolia root extract
Product Type
Herbal dietary supplement
Regulatory Status
Dietary Supplement
Verification
Label Claims Only
03
Claimed Active Ingredients
- CLAIMED INGREDIENTEurycoma longifolia extractVaries; often “standardised” ratio claims
A claimed ingredient is what a label or seller states. It is not treated as confirmed.
04
What Can We Verify?
Established
- Some small trials report modest effects on testosterone or sexual well-being.
Uncertain or unverified
- Study quality is mixed and often industry-funded.
- Heavy-metal contamination has been reported in some products.
05
How It Works
Proposed to support testosterone levels; it does not act on PDE5. Any effect on erections would be indirect.
06
Evidence Level
CLimited Evidence
Grades run from A (strong clinical evidence) to F (unsupported or contradicted). How we grade.
07
Clinical Profile
- Drug Class
- Herbal extract
- Typical Onset
- Cannot be reliably established
- Typical Medical Dosing
- No established dose
08
Benefits / Potential Advantages
- Some small studies suggest modest libido effects
09
Limitations
- Not a direct ED treatment
- Mixed evidence
- Contamination concerns
10
Side Effects & Precautions
Common effects
Insomnia, restlessness, irritability reported.
Major interactions & warnings
- • Contamination with heavy metals has been reported in some tested products.
11
Regulatory Status
FDA ApprovedFDA Cleared DeviceNot FDA ApprovedDietary SupplementCompounded MedicationForeign-Market MedicationUnknownUnverified
Sold as a dietary supplement; not FDA-approved.
12
Marketing Claims vs. Evidence
Claim
What the Evidence Shows
“Doubles testosterone”
Not supported by reliable evidence.
Risk & Verification Summary
Evidence Grade
C — Limited Evidence
Verification Level
Label Claims Only
Regulatory Status
Dietary Supplement
Risk Level
Moderate
No numerical performance score is shown because reliable performance data does not exist for this product.
SynMale Verdict
LIMITED EVIDENCE
Some early signals, but evidence is thin and it is not a direct ED treatment.
Bottom Line
What You Should Know
Tongkat ali is marketed for testosterone and libido. Evidence is small and mixed. It does not work like ED medications. Product quality varies.