Tongkat Ali for Men Over 40: Benefits, Evidence, and Best Brands

Tongkat Ali has been used in Southeast Asian traditional medicine for centuries. Modern researchers have spent the last two decades running controlled trials to find out which of those traditional claims hold up.

The verdict is more nuanced than supplement marketing suggests. Tongkat ali is not a testosterone replacement. It won't restore the levels you had at 25. But for men over 40 dealing with declining free testosterone, stress-driven hormonal suppression, and slower recovery from training, several well-designed studies point to real, measurable benefits through mechanisms researchers now understand.

Here's what the evidence actually shows — dosage, best forms, and what to skip.

Key Takeaways

• Testosterone: Multiple randomized trials show modest but real increases in total testosterone (up to 37% in hypogonadal men) and free testosterone (via reduction of SHBG binding), particularly in men with suboptimal baseline levels.
• Cortisol and stress: A placebo-controlled trial found 200 mg/day of standardized extract reduced cortisol by 16% and improved the testosterone-to-cortisol ratio by 37% in moderately stressed adults over 4 weeks.
• Male fertility: Three months of supplementation improved sperm concentration, motility, and semen volume in men with idiopathic infertility across multiple trials.
• Physical performance: Studies in aging men show improvements in lean muscle mass, grip strength, and muscular force output.
• Dosage: 200 to 400 mg/day of a standardized water-soluble extract (Physta or LJ100) is the most clinically validated protocol. Generic extracts vary too much in eurycomanone content to be reliable.
• Safety: Well tolerated in trials up to 24 weeks. Not appropriate for men with hormone-sensitive cancers or on testosterone therapy without physician supervision.

What Tongkat Ali Is

Tongkat Ali (Eurycoma longifolia) is a flowering plant native to Malaysia, Indonesia, and Thailand. The root is the medicinally active part. It goes by several names: Longjack, Malaysian Ginseng, and in the scientific literature, eurycoma longifolia jack.

The primary active compounds are quassinoids — bitter compounds unique to this plant. The most studied is eurycomanone. Others include eurycomaoside, longilactone, and eurycomalactone. Together, these compounds interact with multiple hormonal pathways in ways that distinguish tongkat ali from generic "testosterone booster" blends.

Standardized extract vs. generic powder: The same quality problem that affects ashwagandha applies here. The clinical trials use proprietary standardized extracts — specifically Physta (produced by Biotropics Malaysia) and LJ100 (by HP Ingredients). These are the same extract with consistent eurycomanone content (typically standardized to 0.8%) and are backed by the published research. Generic tongkat ali powders or "100:1 extracts" without a trademark name have unknown active compound content and are essentially untested in clinical settings.

When you see Physta or LJ100 on a supplement label, you know what you're getting. When you see "tongkat ali root extract (100:1)" on a $15 bottle, you don't.

The Case for Tongkat Ali at 40-Plus

Men over 40 experience a predictable cluster of hormonal changes that tongkat ali specifically targets.

Total testosterone declines approximately 1 to 2 percent per year after age 30. More important for day-to-day function, sex hormone binding globulin (SHBG) — the protein that binds testosterone and renders it inactive — tends to increase with age. The result: even men with normal total testosterone can have insufficient free testosterone, the fraction your cells actually use.

Cortisol also tends to rise across the 40-to-55 age range due to compounding work stress, poor sleep, and the HPA axis changes that accompany midlife. High cortisol suppresses the HPG (hypothalamic-pituitary-gonadal) axis, directly reducing both testosterone production and testosterone sensitivity.

Tongkat ali works on both problems: it appears to reduce SHBG binding (increasing free testosterone from existing total testosterone) and modulate the cortisol-testosterone ratio through stress adaptogen effects. This makes it mechanistically different from approaches that try to stimulate testosterone production directly.

If you suspect low testosterone rather than just age-related SHBG changes, see our breakdown of 10 signs of low testosterone in men over 40 before deciding whether tongkat ali is the right tool.

Testosterone: What the Research Shows

The most-cited study in tongkat ali's testosterone literature comes from Tambi et al. (2012), published in Asian Journal of Andrology. The researchers enrolled 76 men with "late-onset hypogonadism" (LOH) — men with clinical symptoms of low testosterone but not quite low enough to qualify for TRT. After 4 weeks on 200 mg/day of the standardized Physta extract, total testosterone increased from a mean of 5.66 nmol/L to 8.32 nmol/L (a 47% increase). The percentage of men with normal testosterone levels rose from 35.5% to 90.8%.

A few important caveats about that trial: the cohort had clinically low starting levels. Men with normal testosterone should expect smaller absolute gains. And the trial was open-label (no placebo group), which limits what we can conclude.

More rigorous evidence comes from a randomized, double-blind, placebo-controlled trial by Henkel et al. (2014) published in Evidence-Based Complementary and Alternative Medicine. Thirty-two physically active men over 57 years old took 400 mg/day of tongkat ali extract for 5 weeks. Compared to placebo, the treatment group showed significant increases in free testosterone and muscle strength, alongside reductions in the sex hormone binding globulin that was limiting bioavailable testosterone.

A 2022 systematic review and meta-analysis in Healthcare (Kotirum et al.) examined 11 randomized trials and found a consistent modest increase in testosterone across studies, with effects most pronounced in men with baseline testosterone in the low-normal range.

The pattern across the literature is consistent: tongkat ali produces real testosterone improvements in men whose starting levels are suboptimal. It does not appear to move testosterone much in men who are already at the high end of normal. This distinction matters for setting appropriate expectations.

If you want to know your actual levels before deciding on supplementation, read our guide on how to get your testosterone levels checked.

Cortisol Reduction and the Testosterone-to-Cortisol Ratio

A 2013 randomized, double-blind, placebo-controlled trial by Talbott et al. published in the Journal of the International Society of Sports Nutrition examined tongkat ali's effects on stress hormones in moderately stressed (but otherwise healthy) adults.

Participants took 200 mg/day of Physta extract for 4 weeks. Compared to placebo, the treatment group showed:

• 16% reduction in serum cortisol
• 37% improvement in the testosterone-to-cortisol (T/C) ratio
• Significant improvements on the POMS (Profile of Mood States) scale across tension, anger, and confusion subscales

The testosterone-to-cortisol ratio matters because cortisol and testosterone compete for precursor hormones in the adrenal steroidogenic pathway. High cortisol does not just suppress testosterone — it actively competes for the same biochemical building blocks. Improving the T/C ratio, rather than testosterone alone, is a more complete picture of anabolic-to-catabolic balance.

For men over 40 where high work stress and poor sleep are driving hormonal disruption, the cortisol angle may be more clinically relevant than the testosterone angle. You can have total testosterone in the "normal" range but a terrible T/C ratio if your cortisol is chronically elevated.

Male Fertility and Sperm Quality

Tongkat ali has one of the stronger evidence bases in the supplement world for male fertility, and this area is often underreported because the marketing focuses on testosterone.

A 2012 study by Tambi and Imran published in Asian Journal of Andrology followed 75 men with idiopathic male infertility (no identified cause) over 3 months on 200 mg/day of Physta. Compared to baseline, sperm concentration increased by 65.5%, sperm motility improved significantly, and the percentage of semen samples with normal sperm count rose from 14.7% to 21.0%.

A separate 2010 pilot trial published in Andrologia by Solomon et al. found improvements in both sperm concentration and motility after 9 months of tongkat ali supplementation in men with idiopathic infertility.

The probable mechanisms: testosterone directly supports spermatogenesis, and tongkat ali's reduction in oxidative stress markers (documented in several animal and a few human studies) may protect sperm DNA integrity.

This is not a fertility treatment. Men with severe male factor infertility need urological evaluation, not herbal supplements. But for men with mild subfertility and no identified cause, the evidence here is stronger than most alternatives.

Physical Performance and Lean Mass

Studies in aging men specifically (not just athletes) show meaningful effects on body composition and physical capacity.

A randomized controlled trial by Henkel et al. (2014) found that men over 57 taking 400 mg/day of tongkat ali extract for 5 weeks showed significant improvements in grip strength and lean body mass compared to placebo. A subsequent study in the same journal found similar results in a mixed-age group of recreational athletes taking 200 mg/day for 4 weeks.

The mechanism is straightforward: higher free testosterone drives increased muscle protein synthesis. SHBG reduction is likely the key lever — if the same total testosterone produces more free testosterone, you get more anabolic signaling without actually changing production.

For men over 40 who train consistently but notice plateaus in strength or muscle retention, this is where tongkat ali may be useful alongside solid training. The gains won't be dramatic, but the evidence suggests they're real and sustained with continued use.

For the training side of the equation, our guide on how to build muscle after 40 naturally covers programming and protein timing in detail.

Dosage Guide

Standardized Extract (Physta or LJ100)

The standard clinical dose: 200 to 400 mg/day of a Physta or LJ100-certified extract.

Most trials showing significant effects used 200 mg/day. The Henkel 2014 trial used 400 mg/day with older men (57+) and found stronger effects, suggesting higher doses may be appropriate for men with more significant hormonal decline.

Take with water. Most trials administered once daily in the morning. No evidence that splitting the dose changes outcomes.

Timing

Morning dosing is the standard in clinical trials and makes practical sense given that testosterone naturally peaks in the morning. Taking it with breakfast reduces any potential GI discomfort, though tongkat ali is generally well tolerated on an empty stomach.

How Long Until It Works

The Talbott cortisol/mood study showed effects within 4 weeks. The fertility trials ran 3 months. For physical performance and testosterone effects, expect 4 to 8 weeks of consistent use before drawing conclusions.

Unlike some supplements that have immediate subjective effects, tongkat ali works gradually through hormonal recalibration. Don't judge it at week 2.

Cycling

Some practitioners recommend cycling tongkat ali (e.g., 5 days on, 2 days off) to prevent receptor downregulation. This protocol appears in traditional use but has minimal clinical backing. The clinical trials showing benefits ran continuously without cycling. Until there's evidence that continuous use reduces efficacy, continuous dosing is defensible.

How to Choose a Quality Product

The quality problem with tongkat ali is worse than with most supplements because the category has attracted a high density of underdosed and potentially adulterated products.

1. Look for Physta or LJ100 on the label. These are the same water-soluble, standardized extract that appears in the clinical literature. If the label doesn't say one of these names, you're buying unknown quality.

2. Third-party testing. NSF Certified for Sport or Informed Sport certification is essential. Several tongkat ali products have failed independent testing for heavy metals (particularly mercury) because low-quality root material from unregulated sources can concentrate metals. This is not a theoretical concern — it has happened.

3. Avoid proprietary blends. If tongkat ali is ingredient 4 in a "testosterone support complex" at an undisclosed dose, it's almost certainly below the clinically effective threshold. You want tongkat ali as the primary ingredient at a disclosed dose of 200 mg or more.

4. Avoid "100:1" or "200:1" ratio claims without standardization. These ratios describe concentration from crude material but say nothing about eurycomanone content. A 100:1 extract with 0.01% eurycomanone is weaker than a 10:1 extract standardized to 0.8%. The ratio marketing is meaningless without standardization data.

If you're building a supplement stack, see our guide to the best multivitamin for men over 40 for what belongs in the foundation alongside herbs like tongkat ali.

Tongkat Ali vs. Ashwagandha

Men over 40 frequently ask whether to take tongkat ali or ashwagandha for testosterone and stress support. They work through different mechanisms and are not directly interchangeable.

Ashwagandha works primarily by reducing cortisol (via HPA axis modulation). Its testosterone benefit is secondary to cortisol reduction. It also has stronger evidence for sleep quality, anxiety, and cognitive function.

Tongkat ali works primarily through SHBG reduction and possible direct Leydig cell stimulation. Its cortisol benefits are secondary. It has stronger evidence for free testosterone specifically and for male fertility.

The combination is logical and appears safe: lower cortisol from ashwagandha removes the HPG suppression, while tongkat ali increases the bioavailability of whatever testosterone is being produced. Some trials have used both simultaneously without adverse interactions.

If you have to choose one, and stress, sleep, and cortisol are your primary concerns, ashwagandha has more overall evidence. If free testosterone and physical performance are the primary goals, tongkat ali's evidence base is more directly relevant. See our in-depth review of ashwagandha for men over 40 for the full comparison.

Side Effects and Who Should Avoid It

Tongkat ali is well tolerated in clinical trials lasting up to 24 weeks at doses up to 400 mg/day of standardized extract. The most common adverse effects reported are mild and transient.

Insomnia or restlessness: A small percentage of users report difficulty sleeping, particularly if taking it late in the day. Morning dosing mitigates this.

Increased body temperature or sweating: Reported anecdotally and occasionally in trials. Generally mild and resolves with continued use.

GI discomfort: Nausea or stomach cramping in some users at higher doses. Taking with food reduces this.

Increased aggression or irritability: Very rarely reported. More likely with underdosed/contaminated generic products than with standardized extracts.

Men Who Should Avoid Tongkat Ali or Use with Caution

Hormone-sensitive cancers: Prostate cancer, testicular cancer, or any testosterone-sensitive malignancy. Tongkat ali's testosterone-supporting effects are a contraindication. Do not take without explicit oncologist approval.

Men on testosterone replacement therapy (TRT): Your testosterone is already being managed medically. Adding an agent that affects SHBG and Leydig cell function creates unpredictable hormonal variables. Discuss with your prescribing physician.

Kidney disease: The kidneys clear tongkat ali metabolites. Impaired renal function changes the pharmacokinetics significantly.

Men with known prostate issues: The interaction between testosterone support and BPH or prostate cancer risk, while not clearly established, warrants discussion with a urologist before use.

If you take any prescription medications or have a chronic health condition, run this by your doctor before starting. The rule applies across all herbal supplements regardless of evidence quality.

The Bottom Line

Tongkat ali is one of the better-evidenced herbal supplements in the men's health category. The key research points:

• Real testosterone effects in men with suboptimal starting levels, primarily through SHBG reduction and possibly direct Leydig cell stimulation
• Documented cortisol reduction with favorable effects on mood and the testosterone-to-cortisol ratio
• Meaningful sperm quality improvements in men with idiopathic infertility
• Physical performance and lean mass benefits in aging men, driven by increased free testosterone bioavailability

The critical qualifier: use a standardized extract (Physta or LJ100), third-party tested. The category is littered with underdosed generics and contaminated products that share the name without the evidence.

For most men over 40 with low-normal testosterone and significant life stress, 200 mg/day of Physta for 8 to 12 weeks is a reasonable, evidence-backed trial. Track the metrics that matter — morning energy, libido, training recovery, mood — and evaluate from there.

Consult your healthcare provider before starting any new supplement, particularly if you have existing medical conditions, take prescription medications, or have any history of hormone-sensitive conditions.

Frequently Asked Questions

Does tongkat ali actually increase testosterone?

Yes, with an important caveat: the evidence is strongest in men with baseline testosterone in the low or low-normal range. Multiple randomized controlled trials show increases in total and free testosterone with standardized extract at 200 to 400 mg/day. Men with already-normal testosterone levels see smaller absolute gains.

How long does tongkat ali take to work?

Mood and cortisol effects have appeared within 4 weeks in controlled trials. Testosterone, physical performance, and fertility improvements have been documented at 4 to 12 weeks. Give it at least 8 weeks of consistent daily use before judging effectiveness.

What is the best form of tongkat ali to buy?

Look for Physta or LJ100 branded extracts specifically — these are the forms used in published clinical trials and are standardized to known eurycomanone content. NSF Certified for Sport or Informed Sport certification adds an important safety check against contamination.

Can I take tongkat ali and ashwagandha together?

Yes. They work through complementary mechanisms — ashwagandha primarily lowers cortisol, tongkat ali primarily increases free testosterone bioavailability. No known adverse interactions. Some practitioners specifically recommend the combination for men over 40 dealing with both cortisol elevation and declining testosterone.

Does tongkat ali have side effects?

It's generally well tolerated at clinical doses in men without contraindications. The main side effects are insomnia if taken late in the day, occasional GI discomfort (take with food), and rarely increased restlessness. More serious: men with hormone-sensitive cancers or on TRT should not take it without physician supervision.

Is tongkat ali safe long-term?

Clinical trials have run up to 24 weeks without significant adverse events. Long-term safety data beyond that is limited. Given that it modulates hormone levels, periodic breaks (e.g., cycling 3 months on, 1 month off) are a reasonable precaution until more long-term data is available.

How does tongkat ali compare to testosterone boosters?

Most products marketed as "testosterone boosters" contain undisclosed doses of multiple herbs, most of which lack meaningful clinical evidence. Tongkat ali as a single ingredient at a clinical dose with a standardized extract is a fundamentally different proposition — one with RCT evidence behind it. For a full breakdown of what works and what doesn't in the testosterone supplement category, see our evidence-based review of whether testosterone boosters actually work.