Browse the site

Start with a goal 40 things people take supplements for — sleep, stress, joints, focus.
Home Get the app
Eurycoma Longifolia

Eurycoma Longifolia

Best for

Raise testosterone levels in men

Large effect, needs confirmation 100–600 mg/day 1–12 weeks 1 meta-analysis, n=302 #1 of 12 studied

  • 10 papers
  • 7 of 35 outcomes
  • 3 positive

Eurycoma longifolia shows a large effect on testosterone when levels are low, with early erection and strength signals that still need confirmation.

Median effective dose, most-studied outcomes

  • Support healthy testosterone in men 200 mg 1–12 wk
  • Support healthier cortisol patterns 200 mg 1–12 wk
  • Get and keep firmer erections 300 mg 12 wk
Full protocol, 9 outcomes

Risk, worst reported severity

  • headache mild
  • gastrointestinal symptoms (constipation, dyspepsia, abdominal pain, flatulence, abdominal discomfort) mild
  • propranolol moderate
  • rosiglitazone moderate
All 17 events and interactions

What eurycoma longifolia actually does

Outcome Effect Evidence Dose Time Rank
Worth watching 3
Raise testosterone levels in men Large effect, needs confirmation Testosterone levels in men are tied to sex drive, erections, muscle mass, and energy.
large 		1 meta-analysis 5 papers · n=302 100–600 mg 1–12 wk #1 /12
More reliable erections Large effect, needs confirmation Erectile function shapes comfort, confidence, and intimacy during sex.
large 		1 meta-analysis 2 papers · n=241 200–300 mg 12 wk #4 /8
Get stronger Promising early signal Strength helps your muscles produce more force for lifting, carrying, and daily movement.
moderate 		2 RCTs 2 papers · n=161 200–300 mg 12 wk —
Early research 4
Feel less stressed day to day Not enough research Daily stress is the sense that life's demands are stretching beyond what you can handle.
— 		3 RCTs 3 papers · n=70 200–400 mg 1–12 wk —
Feel more sexual desire Not enough research Sexual desire and arousal can make intimacy feel more wanted and engaging.
— 		1 RCT 1 papers · n=— 300 mg 12 wk —
Feel less tired every day Not enough research Everyday energy helps you get through daily tasks without feeling worn down.
— 		2 RCTs 2 papers · n=— 100–200 mg 4–12 wk —
Greater sexual satisfaction Not enough research A satisfying sex life can include enjoyment, connection, and time for intimacy.
— 		1 RCT 1 papers · n=— 300 mg 12 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

For its best-studied outcome, trials used 100 to 600 mg daily of oral root extract for testosterone-related measures, with 200 mg daily as the middle of the studied range. 2 Early erection research used 200 to 300 mg daily, while the small sexual desire and satisfaction studies used 300 mg daily. 3 These are study protocols, not proof that a higher dose produces a better result.

When and how long

The trials test daily use over weeks, not an occasional dose before a workout or date night. Testosterone and sexual-function protocols commonly ran for 12 weeks, while stress studies often assessed outcomes around 4 weeks and fatigue studies around 8 weeks. 123 Research does not establish a meaningful advantage for morning versus evening use, or for taking it with food versus without food, so pick a consistent time you tolerate well.

Forms & standardisation

Look for a product that clearly identifies Eurycoma longifolia root extract and states the extract amount per daily serving. The human studies used prepared root extracts, including water-based preparations, rather than vague proprietary blends. 23 An extract ratio alone does not tell you whether two products match, so prioritize transparent labeling and independent quality testing.

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Support healthy testosterone in men 100–600 mg 200 mg 1–12 wk 5 papers 5 sig. endpoints
Support healthier cortisol patterns 200–400 mg 200 mg 1–12 wk 3 papers 1 sig. endpoint
Get and keep firmer erections 200–300 mg 300 mg 12 wk 2 papers 5 sig. endpoints
Have less fatigue 100–200 mg 150 mg 4–12 wk 2 papers 2 sig. endpoints
Increase everyday strength 200–300 mg 250 mg 12 wk 2 papers 2 sig. endpoints
Feel more sexual desire 300 mg 300 mg 12 wk 1 paper 1 sig. endpoint
Ease symptoms of male aging 100–200 mg 150 mg 12 wk 1 paper 2 sig. endpoints
Handle daily demands with less stress 200 mg 200 mg 4 wk 1 paper 1 sig. endpoint
Enjoy more satisfying sex 300 mg 300 mg 12 wk 1 paper 1 sig. endpoint

Adverse events and drug interactions

Safety events

headache mild
gastrointestinal symptoms (constipation, dyspepsia, abdominal pain, flatulence, abdominal discomfort) mild
pruritus mild
fever mild
bloating mild
breast tenderness mild
flatulence mild
abdominal discomfort mild

Drug interactions

propranolol moderate decreases concentration
rosiglitazone moderate decreases concentration
blood glucose lowering moderate unknown
antineoplastic agents moderate increases concentration
lipid modifying agents moderate increases concentration
blood glucose lowering moderate increases concentration
other moderate increases concentration
antipsychotics moderate increases concentration
paracetamol minor decreases effect
Buy well

Recommended Eurycoma Longifolia products

Real products that dose Eurycoma Longifolia where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Eurycoma Longifolia dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • Across 5 studies (n=302), Eurycoma longifolia improved testosterone across 10 endpoints in men with low levels.3
  • Ten papers reviewed here span 35 outcomes, including erections, strength, stress, and fatigue.

Eurycoma longifolia, usually called tongkat ali or longjack, comes from the root of a Southeast Asian shrub. Supplements use dried root or concentrated root extracts, which matters because products sold under the same name can deliver very different amounts of root compounds.

Researchers are still mapping the exact route, but human trials link tongkat ali use with shifts in testosterone and cortisol measurements, especially in stressed people and men with lower starting testosterone. 12 Think of it less like adding testosterone from outside and more like adjusting the body's hormone-control thermostat, although that thermostat explanation remains incomplete. 12

Bottom line

Eurycoma longifolia is worth watching for men with low testosterone who want to discuss a supplement alongside a proper evaluation of why levels are low. Early signals for erections, strength, stress, and fatigue are interesting, but they are not settled science. Skip self-experimenting if you use prescription medicines without checking with a clinician or pharmacist first.

Frequently asked

Common questions

Does Eurycoma longifolia raise testosterone?

Early human trials suggest it supports testosterone in men with low levels, but the evidence base remains small and needs larger confirmation studies. It is not a shortcut around finding the reason testosterone is low. 2

How long does Eurycoma longifolia take to work?

The testosterone and erection studies generally ran for up to 12 weeks, while stress-related outcomes appeared over about 4 weeks in some trials. Take it consistently and judge results over weeks, not days. 123

Is Eurycoma longifolia the same as tongkat ali?

Yes. Tongkat ali is the common name for Eurycoma longifolia, a Southeast Asian root used in standardized extract form.

Does Eurycoma longifolia help erections?

Two early studies found improved erection firmness at 200 to 300 mg daily, but that is still a small evidence base. Persistent erection changes deserve medical attention because they can reflect broader health issues. 3

Sources

Sources

  1. 1. Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects (2013) ↑
  2. 2. Eurycoma longifolia Jack: A potent adaptogen in the management of stress and aging males (2012) ↑
  3. 3. Randomized clinical trial on the use of PHYSTA freeze-dried water extract of Eurycoma longifolia for the improvement of quality of life and sexual well-being in men

Generated August 27, 2026

Related

More evidence for Eurycoma Longifolia