Herbal Extract
Longjack Extract (Eurycoma longifolia)
Also known as: Tongkat Ali, Eurycoma longifolia, Malaysian Ginseng, LJ100
Longjack is a traditional Southeast Asian herb studied primarily for testosterone support and male fertility enhancement. Evidence suggests potential benefits for testosterone levels and sexual function in men, though quality of research varies.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Longjack Extract (Eurycoma longifolia) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Transparent Labs Tongkat Ali | 91 A | $0.50 |
| 2 | Nutricost Tongkat Ali Capsules | 87 A | $0.27 |
| 3 | Nootropics Depot Eurycomax Capsules | 86 A- | $2.17 |
| 4 | Gorilla Mind Sigma | 85 A- | $0.83 |
| 5 | NOW Foods Testo Jack 200 | 83 A- | $0.57 |
| 6 | NOW Foods TestoJack 100 | 83 A- | $0.53 |
| 7 | Nootropics Depot Tongkat Ali Extract Capsules or Tablets | 80 A- | $0.67 |
| 8 | Double Wood LJ-100 Tongkat Ali Supplement | 78 B+ | $0.33 |
| 9 | Bluebonnet Nutrition INTIMATE ESSENTIALS FOR HIM TESTOSTERONE & LIBIDO BOOST | 66 B- | $1.93 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Longjack Extract (Eurycoma longifolia) should I take?
The typical range is 200-400 mg daily (standardized extract containing 22% eurycomanone). Most studies used 4-12 weeks; benefits may accumulate over 8+ weeks of consistent use
When should I take Longjack Extract (Eurycoma longifolia)?
Typically taken once daily with meals. Often taken with food to improve absorption and reduce GI upset.
Which form of Longjack Extract (Eurycoma longifolia) is best?
Root extract powder. Other forms in the catalog: Capsules, Standardized extract.
Is Longjack Extract (Eurycoma longifolia) safe?
Commonly reported: Insomnia or sleep disturbances (in some users), Mild gastrointestinal upset, Increased body temperature, Restlessness or increased energy.
Which Longjack Extract (Eurycoma longifolia) supplement scores highest?
Transparent Labs Tongkat Ali, at 91/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Testosterone support
- Male sexual function
- Male fertility
- Muscle strength and athletic performance
How it works
- Bioactive alkaloids (eurycomanone) may modulate luteinizing hormone (LH) and testosterone production
- Potential antioxidant and stress-reducing effects
- May improve sperm quality and motility
Dosage
- Typical range
- 200-400 mg daily (standardized extract containing 22% eurycomanone)
- Timing
- Typically taken once daily with meals
- With food
- Often taken with food to improve absorption and reduce GI upset
- Duration
- Most studies used 4-12 weeks; benefits may accumulate over 8+ weeks of consistent use
- Special populations
- Limited safety data in women and adolescents; not recommended during pregnancy or breastfeeding
Forms
- Root extract powder· 70/100
- Capsules· 70/100
- Standardized extract· 70/100
Safety
Common side effects
- Insomnia or sleep disturbances (in some users)
- Mild gastrointestinal upset
- Increased body temperature
- Restlessness or increased energy
Contraindications
- Pregnancy and breastfeeding
- Hormone-sensitive cancers (theoretical concern; consult healthcare provider)
- Men with prostate cancer or elevated PSA
- Individuals on testosterone replacement therapy (additive effects possible)
Products containing Longjack Extract (Eurycoma longifolia)
Top-scoring supplements in our catalog that list Longjack Extract (Eurycoma longifolia) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Multiple human RCTs demonstrate modest improvements in testosterone levels and sexual function in men; however, study quality varies, sample sizes are often small, and effects are inconsistent across populations. Strong tradition of use with reasonable mechanistic support justifies B grade rather than C.
Grade B: Some human trials support key claims; further confirmation needed.
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.