How Much Tongkat Ali Per Day? Huberman’s Dosage

Andrew Huberman has publicly recommended taking 400 mg of Tongkat Ali (Eurycoma longifolia) per day, typically as a standardized water extract, a dose that sits at the upper end of what clinical trials have tested. That figure aligns reasonably well with published research, though the evidence base is still modest, and important details about extract quality, cycling, and individual variation deserve a closer look before you start a regimen.

What Huberman Has Recommended

On multiple episodes of the Huberman Lab podcast, Andrew Huberman has described taking 400 mg daily of a Tongkat Ali root extract standardized for its active compounds. He has discussed this primarily in the context of supporting healthy testosterone levels, improving energy, and managing cortisol. Huberman has also mentioned the possibility of cycling the supplement, taking it for several weeks and then pausing, though he has not been entirely rigid or prescriptive about cycling schedules.

Huberman typically emphasizes choosing a reputable extract with third-party testing, and he has partnered with the supplement brand Momentous, which sells a Tongkat Ali product at the 400 mg dose he endorses. It’s worth noting that Huberman is a neuroscientist, not an endocrinologist, and his recommendations draw on published studies rather than his own clinical trials. That does not make them wrong, but it means you’re getting an informed scientist’s interpretation of limited literature rather than a physician’s clinical guideline.

What the Clinical Trials Actually Used

Most human trials have tested daily doses between 200 mg and 400 mg of a hot-water root extract. A double-blind trial involving men with age-related testosterone decline used 200 mg per day for 6 months, combining the supplement with concurrent exercise training, and found improvements in erectile function and total testosterone levels.¹ A study of physically active older adults (ages 57 to 72) used 400 mg per day for five weeks and found significant increases in both total and free testosterone, along with improvements in muscular force, in men and women.²

A widely cited stress-hormone trial gave 63 moderately stressed men and women a standardized hot-water extract for four weeks. The dose was 200 mg per day. Results showed a 16% reduction in salivary cortisol and a 37% increase in testosterone status compared to placebo.³ So both the 200 mg and 400 mg doses have produced measurable hormonal shifts in trials, though no head-to-head study has directly compared the two doses in the same population to tell you whether doubling the amount meaningfully doubles the effect.

Huberman’s 400 mg recommendation falls at the higher end of this tested range. That does not automatically make it better. People who weigh less, are younger, or have normal baseline testosterone might reasonably start at 200 mg and see how they respond before increasing. The evidence simply does not tell us where the dose-response curve flattens out.

Extract Standardization Matters More Than You Think

A major complication with Tongkat Ali dosing is that “400 mg” does not describe the same thing across all products. Tongkat Ali supplements are extracts, meaning the raw root material has been processed and concentrated. Different brands use different extraction methods, root-to-extract ratios (commonly 100:1 or 200:1), and standardization targets. The key bioactive compound is eurycomanone, and a product’s potency depends on how much of it survives the extraction process.

Pharmacokinetic work in animal models has characterized how eurycomanone is absorbed and processed after oral dosing, confirming that the compound reaches meaningful plasma concentrations when delivered either as a purified isolate or within a whole extract.⁴ But those results depend heavily on the extract used. Two capsules that both say “400 mg Tongkat Ali” on the label might contain very different amounts of eurycomanone depending on how they were made. This is one of the biggest practical problems with following any fixed dose recommendation, including Huberman’s.

When Huberman and most clinical researchers say “400 mg,” they generally mean a standardized hot-water root extract, the same type that has been used in Malaysian clinical trials. If a product uses an alcohol extraction or simply ground raw root powder, you are looking at a fundamentally different preparation, and the dose equivalence is unknown.

Testosterone, Cortisol, and Who Benefits Most

The mechanism behind Tongkat Ali’s hormonal effects is not a simple testosterone booster in the way anabolic steroids work. It does not introduce exogenous hormones. Instead, the evidence suggests it helps restore testosterone levels in people whose levels are below their natural baseline due to stress, aging, or overtraining. It has been described as a phytoandrogenic agent, meaning it supports the body’s own androgen production rather than replacing it.⁵

This distinction matters for setting expectations. If you are a healthy 25-year-old with normal testosterone, Tongkat Ali is unlikely to push your levels into some supra-physiological range. The research showing the largest hormonal changes has tended to involve people who were starting from a deficit: older adults with age-related decline, chronically stressed individuals, or men diagnosed with androgen deficiency. The 37% testosterone increase in the stress-hormone trial, for example, was measured in people who were moderately stressed at baseline, a population more likely to have suppressed hormone profiles.³

For athletes, the appeal often lies in the cortisol side of the equation. Overtraining and inadequate recovery drive cortisol up and testosterone down, creating a hormonal profile that undermines performance and muscle recovery. Tongkat Ali has been positioned as a way to help maintain a healthier cortisol-to-testosterone ratio, potentially supporting sports performance, body composition, and recovery from hard training.⁶ The research on this is still preliminary, but the theoretical rationale is at least consistent with the hormonal data.

Effects on Male Fertility

One area where Tongkat Ali has more substantial clinical evidence is male fertility, specifically semen quality. A study of 350 men with unexplained infertility used 200 mg daily. Among those who completed a full three-month treatment cycle, all major semen parameters improved significantly, including sperm concentration, motility, and morphology.⁷ Eleven percent of the couples in the study achieved spontaneous pregnancy during the treatment period.

This is one of the larger clinical studies on Tongkat Ali, and the 200 mg dose used here is half of what Huberman recommends. If fertility improvement is your primary goal, the evidence suggests 200 mg is a reasonable starting point. Whether 400 mg would produce faster or larger improvements remains untested in this context.

Safety, Side Effects, and How Long You Can Take It

The safety profile of Tongkat Ali at the doses used in research looks reassuring so far, though the longest trials are only about six months. A study in recreational athletes found that six weeks of supplementation at a standard dose did not adversely affect liver or kidney function markers. Urinary testosterone-to-epitestosterone ratios also stayed within normal bounds, meaning it was unlikely to trigger a positive result on standard anti-doping tests.⁸

Commonly reported side effects in trials and anecdotal reports include mild insomnia, restlessness, and occasional gastrointestinal discomfort. Some users report feeling overly stimulated when they first start taking it, which is why some people prefer to take it in the morning rather than in the evening. These side effects are generally mild and tend to resolve as the body adjusts.

One open question is whether continuous daily use is better or worse than cycling. Huberman has mentioned cycling as an option, and some users follow schedules like five days on and two days off, or four weeks on and one week off. There is no clinical trial that tests cycling versus continuous use, so any cycling protocol is based on anecdotal reasoning and precaution rather than data. The concern behind cycling is usually about preventing the body from downregulating its own hormonal pathways in response to consistent supplementation, but there is no published evidence that this actually happens with Tongkat Ali at the doses being discussed.

Contamination and Product Quality Risks

One of the most underappreciated risks with Tongkat Ali has nothing to do with the herb itself but with what else ends up in the capsule. An analysis of Tongkat Ali products found that 26% contained mercury levels between 0.53 and 2.35 parts per million, exceeding quality standards for traditional medicines.⁹ Heavy metal contamination is a recurring problem in herbal supplement markets, and Tongkat Ali is no exception.

Beyond heavy metals, some products have historically been adulterated with undeclared pharmaceutical compounds, including prescription erectile dysfunction drugs. This is not unique to Tongkat Ali; it plagues the broader male enhancement supplement category. The practical takeaway is that buying cheap, untested products from unknown brands is genuinely risky. Choosing supplements that carry third-party certifications from organizations that test for contaminants and verify label accuracy is not just marketing fluff here; it’s a real safety measure.

This is one area where Huberman’s advice to use tested, reputable brands has genuine merit independent of any commercial relationship. The difference between a well-sourced Malaysian extract and a random product from an unvetted manufacturer is potentially the difference between getting the herbal compound you want and getting a dose of mercury or a hidden pharmaceutical.

Regulatory Landscape Varies by Country

Tongkat Ali is widely available as a dietary supplement in the United States, where it is regulated under the Dietary Supplement Health and Education Act, meaning the FDA does not approve it for safety or efficacy before it goes to market. In Malaysia, where Tongkat Ali grows natively, standardized extracts have a long history of use and are regulated as traditional medicine.

The situation is different in the European Union. The European Food Safety Authority evaluated a Tongkat Ali extract as a novel food and raised concerns about its potential to induce DNA damage, particularly at the first sites of tissue contact (essentially the mouth, esophagus, and stomach lining). The panel concluded that safety had not been established under any condition of use. As a result, Tongkat Ali products are restricted or effectively banned in several EU countries, including France. This stands in sharp contrast to its unregulated availability in the U.S. and its traditional-medicine status in Southeast Asia.

The EFSA’s concern centers on genotoxicity findings in laboratory assays. Whether these translate to real-world harm at typical supplement doses in humans is not yet clear, and no epidemiological data has linked standard Tongkat Ali supplementation to increased cancer risk. But the regulatory divergence between the U.S. and EU is worth knowing about, particularly if you live in a jurisdiction where it is restricted or if the genotoxicity question gives you pause.

Women and Tongkat Ali

Most of the conversation around Tongkat Ali focuses on men, but the hormone data is not exclusively male. The stress-hormone trial that found cortisol reductions and testosterone increases included 31 women alongside 32 men.³ The pilot study on older physically active adults also included 12 women and found significant increases in their testosterone and muscular force as well.²

Women naturally produce testosterone, just in much smaller amounts, and it plays a role in energy, mood, libido, and muscle maintenance. The small amount of available evidence suggests women can experience hormonal shifts from Tongkat Ali supplementation, though no one has established whether the optimal dose differs between sexes. Both of the studies that included women used 200 mg per day. Until more data exists, that lower dose seems like a reasonable starting point for women, with the same caveats about extract quality and individual response that apply to everyone.

Timing, Food, and Practical Dosing Details

Clinical trials have not systematically tested whether Tongkat Ali is better absorbed with or without food, so there is no strong evidence-based recommendation on timing relative to meals. Most protocols in published research simply instructed participants to take it daily, without specifying meal timing.

Anecdotally, many users take it in the morning, partly because some people experience a mild energizing effect that can interfere with sleep if taken later in the day. If you find it causes restlessness or insomnia, switching to a morning dose is a sensible first adjustment before reducing the amount.

For people who want to start conservatively, 200 mg per day is well supported by the clinical literature as an effective dose for hormonal and fertility outcomes. Huberman’s 400 mg recommendation also has trial support and is within the tested range, but it is not demonstrably better than 200 mg for most endpoints. Starting lower and adjusting upward based on your response and tolerance is a pragmatic approach that the published evidence does not argue against. If you are taking Tongkat Ali specifically for fertility, the 200 mg dose has the most direct trial support in that context, tested over a three-month treatment cycle.⁷

One practical detail that rarely comes up: the clinical trials showing positive results ran for a minimum of four to five weeks before hormonal changes became statistically significant. If you try Tongkat Ali for a week and feel nothing, that does not mean it is not working. Give it at least a month at a consistent dose before drawing conclusions about whether it’s doing anything for you.