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Moderate evidenceMen's health

Tongkat Ali

Tongkat ali is the one testosterone-booster herb with a positive meta-analysis behind it, though the effect is clearest in older or hypogonadal men rather than healthy young ones. Trial quality is mixed and extract standardisation varies widely, so treat the effect size with caution.

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What the science says

  • Raising serum total testosterone Moderate evidence

    A 2022 systematic review and meta-analysis of clinical trials found Eurycoma longifolia significantly increased serum total testosterone in men, with the effect most consistent in participants who were older or had low baseline testosterone. Trials in eugonadal young men are more often null, so it behaves like a restorative rather than a booster.

  • Erectile function and sexual wellbeing Moderate evidence

    A 6-month double-blind placebo-controlled RCT in men with androgen deficiency of the aging male used 200 mg/day alongside concurrent training and reported improvements in erectile function and testosterone levels. Several other 12-week trials at 200-300 mg/day report improved sexual function and quality-of-life scores in aging men, though several were manufacturer-supported.

  • Stress, cortisol and mood Limited evidence

    A small trial in moderately stressed adults reported reduced salivary cortisol and improved tension and confusion scores at 200 mg/day for 4 weeks. This finding is quoted constantly but has not been replicated in adequately powered trials.

  • Strength, power and body composition Limited evidence

    Trials combining tongkat ali with resistance training report inconsistent effects on strength and lean mass, and where testosterone rises the change is usually too small to plausibly drive body composition change. Do not expect gym results from it.

Dosage & safety

Studied dose200-400 mg/day of a standardised hot-water root extract (trials most often use material standardised to eurycomanone and glycosaponin content), taken for 4 weeks up to 6 months. Crude root powder doses are much higher and not comparable.
SafetyGenerally well tolerated at trial doses; reported effects include insomnia, restlessness, irritability and mild GI upset. Heavy metal contamination, particularly mercury and lead, has been documented in tongkat ali products, so third-party tested material matters. Because it may raise testosterone, avoid in prostate cancer, hormone-sensitive conditions, and in pregnancy or breastfeeding. It may add to the effect of antihypertensive and antidiabetic medication, and animal data suggest a possible interaction with propranolol. Not currently prohibited by WADA, but athletes should note that testosterone-active herbals can complicate a steroid profile.

How to take it

TimingMorning, since insomnia, restlessness and irritability are the commonly reported effects and evening dosing makes them worse.
With food?With or without food.
Worth knowingMercury and lead contamination has been documented in this category specifically, so a certificate of analysis for heavy metals is not optional here.

Interactions

With medications

  • antihypertensives

    Tongkat ali may add to blood-pressure lowering. monitor blood pressure when you start

  • insulin and other antidiabetic medication

    Possible additive glucose lowering. monitor glucose more closely if you combine them

  • propranolol

    Animal data suggest tongkat ali reduces propranolol absorption. separate by at least 2 hours and tell your prescriber

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does tongkat ali raise testosterone?

Tongkat ali has moderate evidence: a 2022 meta-analysis found it significantly increased total testosterone in men, most consistently in older men or those with low baseline levels. Trials in young men with normal testosterone are more often null, so it acts more as a restorative than a booster.

How much tongkat ali should I take per day?

Trials use 200-400 mg/day of a standardised hot-water root extract for 4 weeks up to 6 months. Crude root powder doses are much higher and not comparable, and morning dosing avoids the insomnia and restlessness some people report.

Does tongkat ali help build muscle?

The evidence is limited: trials pairing tongkat ali with resistance training show inconsistent effects on strength and lean mass, and any testosterone rise is usually too small to drive body composition change. Do not expect gym results from tongkat ali.

What are the risks of tongkat ali?

Tongkat ali is generally well tolerated but can cause insomnia, restlessness, irritability and mild stomach upset, and mercury and lead contamination has been documented, so choose third-party tested products. Avoid it with prostate cancer, hormone-sensitive conditions, pregnancy or breastfeeding, and monitor if you take blood pressure or diabetes medication.

Scientific references

Where to buy

Nutricost, Tongkat Ali, 120 Capsules

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