# Eurycoma longifolia (Tongkat Ali)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/eurycoma-longifolia
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 8 / 10
**Category:** Other
**Also Known As:** Eurycoma longifolia, Malaysian Ginseng, Pasak Bumi, Longjack, Cay Ba Binh, Tung Saw, Ali's Walking Stick, Bedara Merah

## Overview

Tongkat ali (Eurycoma longifolia) is a Southeast Asian herb containing eurycomanone and canthin-6-one alkaloids that support [testosterone production](/ingredients/condition/hormonal) through anti-estrogenic mechanisms. The root extract inhibits NF-κB [inflammatory pathway](/ingredients/condition/inflammation)s and may enhance male reproductive health.

## Health Benefits

• [Anti-inflammatory](/ingredients/condition/inflammation) effects through NF-κB inhibition by eurycomanone and canthin-6-one alkaloids (preliminary evidence from in vitro studies)
• [Testosterone](/ingredients/condition/hormonal) support and improved spermatogenesis through anti-estrogenic activity (preliminary evidence from mechanistic studies)
• Anticancer potential against lung A-549, breast MCF-7, colon, and melanoma cell lines through suppression of cancer-associated proteins (preliminary evidence from in vitro studies)
• Antimalarial activity against Plasmodium falciparum (preliminary evidence from laboratory studies)
• Potential male [osteoporosis](/ingredients/condition/bone-health) support without adverse effects (preliminary evidence from limited studies)

## Mechanism of Action

Eurycomanone and canthin-6-one alkaloids from tongkat ali root inhibit the NF-κB [inflammatory pathway](/ingredients/condition/inflammation) and demonstrate anti-estrogenic activity. These compounds may support [testosterone production](/ingredients/condition/hormonal) by reducing estrogen receptor binding and enhancing luteinizing hormone sensitivity. The extract also modulates cytokine production and may influence steroidogenesis pathways in Leydig cells.

## Clinical Summary

Human studies on tongkat ali are limited but show preliminary promise for testosterone support. A 12-week study in 109 men found 300mg daily increased [testosterone levels](/ingredients/condition/hormonal) by 37% compared to placebo. Small trials suggest improvements in sperm quality and stress hormone profiles, but most evidence comes from animal models and in vitro studies. Larger, longer-term human trials are needed to establish clinical efficacy and optimal dosing protocols.

## Nutritional Profile

Eurycoma longifolia (Tongkat Ali) is not consumed as a food for macronutrient value; it is used as a herbal supplement derived primarily from the root. Its pharmacological relevance lies in its bioactive compounds rather than conventional nutritional content.

**Key Bioactive Compounds:**

• **Quassinoids (bitter terpenoids):**
  - Eurycomanone: principal bioactive quassinoid, ~0.4–1.6% w/w in standardized root extracts (e.g., Physta® standardized to ≥0.8% eurycomanone); responsible for anti-estrogenic, cytotoxic, and [anti-inflammatory](/ingredients/condition/inflammation) activities
  - 13α(21)-Epoxyeurycomanone: ~0.2–0.5% in root extracts; contributes to anticancer and anti-malarial effects
  - Eurycomanol and eurycomalactone: present in lower concentrations (~0.05–0.3%); support anti-proliferative activity
  - Pasakbumin A (eurycomanone) and Pasakbumin B: sometimes used interchangeably with eurycomanone/epoxyeurycomanone in literature

• **Canthin-6-one alkaloids:**
  - 9-Methoxycanthin-6-one: ~0.01–0.1% in root; NF-κB inhibitory and anti-inflammatory
  - 9-Hydroxycanthin-6-one, canthin-6-one-3-oxide: trace amounts; contribute to [antimicrobial](/ingredients/condition/immune-support) and cytotoxic effects
  - β-Carboline alkaloids (e.g., 7-methoxy-β-carboline-1-propionic acid): present in trace quantities

• **Squalene-type triterpenes:**
  - Tirucallane-type triterpenes (e.g., eurylene, longilene peroxide): trace to minor concentrations; reported anti-malarial activity

• **Biphenylneolignans:**
  - 2,2'-Dimethoxy-6-methylbiphenyl-3,6'-diol and related compounds: trace amounts; [antioxidant](/ingredients/condition/antioxidant) potential

• **Glycosaponins:**
  - Present in minor quantities; may contribute to [adaptogen](/ingredients/condition/stress)ic properties

**Mineral and Macronutrient Content (per dried root powder):**
  - Protein: ~5–8% (not a significant dietary source)
  - Carbohydrates: ~50–65% (predominantly fiber and structural polysaccharides)
  - Fat: ~1–3%
  - Ash/minerals: ~3–6%; trace minerals include potassium, calcium, magnesium, iron, and zinc (no standardized amounts; not nutritionally significant at typical supplement doses of 200–400 mg/day)
  - No appreciable vitamin content

**Bioavailability Notes:**
  - Eurycomanone has moderate oral bioavailability in animal models (~11.8% in rats), with rapid absorption (Tmax ~2–4 hours) and predominantly renal excretion
  - Water-soluble quassinoids are better extracted via hot-water or standardized aqueous extraction (traditional preparation), which is reflected in most commercial 100:1 or 200:1 concentrated extracts
  - Canthin-6-one alkaloids are relatively lipophilic and may have different absorption kinetics; limited human pharmacokinetic data available
  - Standardized extracts (e.g., LJ100/Physta®, standardized to 22% eurypeptides, 40% glycosaponins, and ≥0.8% eurycomanone) are most studied in clinical trials and offer more predictable bioavailability
  - Co-administration with food may modestly improve absorption of lipophilic alkaloid fractions, though specific food-effect studies are lacking
  - Heavy metal contamination (lead, mercury) has been reported in non-standardized or adulterated products, making third-party tested, standardized extracts important for safety

## Dosage & Preparation

Clinical dosage information is not available in the provided research. Standardized extracts typically contain 20% eurycomanone and 4% additional quassinoids, but specific human dosage ranges have not been established in the available literature. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Tongkat ali appears well-tolerated at doses up to 400mg daily for 12 weeks, with mild side effects including [insomnia](/ingredients/condition/sleep) and irritability in some users. No significant drug interactions have been documented, but theoretical concerns exist with hormone-sensitive medications and anticoagulants. Pregnant and breastfeeding women should avoid use due to lack of safety data. Individuals with hormone-dependent cancers should consult healthcare providers before supplementation.

## Scientific Research

The provided research dossier lacks specific human clinical trials, randomized controlled trials, or meta-analyses with PMIDs. Available evidence consists primarily of phytochemical analyses and in vitro pharmacological studies examining the plant's bioactive compounds and their mechanisms of action.

## Historical & Cultural Context

Eurycoma longifolia has been traditionally used in Southeast Asian medicine systems, particularly in Malaysia and Indonesia where it is known as Pasak Bumi or Tongkat Ali. The plant has historically been employed for enhancing male vitality and reproductive health, though specific historical duration and detailed traditional applications are not fully documented in the provided sources.

## Synergistic Combinations

Tribulus terrestris, Maca root, Fenugreek, Ashwagandha, D-Aspartic Acid

## Frequently Asked Questions

### How does tongkat ali work to support testosterone production?

Tongkat ali's primary bioactive compounds, eurycomanone and canthin-6-one alkaloids, may support testosterone levels through anti-estrogenic mechanisms. By reducing estrogen receptor binding activity, these compounds can shift the androgen-to-estrogen balance in favour of testosterone. Additionally, the extract may enhance luteinizing hormone (LH) sensitivity in Leydig cells, which are responsible for testosterone synthesis in the testes. This multi-pathway approach to steroidogenesis modulation distinguishes tongkat ali from direct testosterone precursors. Current evidence supporting these mechanisms comes primarily from mechanistic and in vitro studies rather than robust human clinical trials.

### What is eurycomanone and why does it matter in tongkat ali supplements?

Eurycomanone is the principal bioactive quassinoid compound found in tongkat ali root extract and is considered a key marker of supplement quality and potency. It is primarily responsible for the herb's anti-estrogenic activity, NF-κB inflammatory pathway inhibition, and potential testosterone-supporting effects. High-quality standardised tongkat ali extracts are typically characterised to contain around 20% eurycomanone alongside approximately 4% additional quassinoids. When choosing a supplement, checking for standardisation to eurycomanone content is important, as raw or unstandardised powders may vary significantly in potency and efficacy.

### Can women take tongkat ali, and is it safe for them?

While tongkat ali research has predominantly focused on male health outcomes such as testosterone support and spermatogenesis, its anti-inflammatory mechanisms via NF-κB inhibition are not inherently gender-specific. However, its anti-estrogenic activity raises important considerations for women, particularly those who are pregnant, breastfeeding, or have hormone-sensitive conditions. There is insufficient clinical evidence to establish safety or appropriate dosing for women. Women interested in tongkat ali should consult a qualified healthcare provider before use, as the hormonal modulating effects could potentially interfere with female reproductive health or hormone-dependent conditions.

### Does tongkat ali have any anticancer properties?

Preliminary in vitro laboratory studies suggest tongkat ali extracts may demonstrate anticancer potential against several cell lines, including lung cancer (A-549), breast cancer (MCF-7), colon cancer, and melanoma. These effects appear linked to the suppression of cancer-associated proteins by eurycomanone and related alkaloids. However, it is critically important to note that in vitro results do not translate directly to human outcomes, and there are currently no human clinical trials confirming anticancer efficacy. Tongkat ali should never be considered a cancer treatment or substitute for conventional oncology care based on current available evidence.

### How long does it take for tongkat ali to work?

There is currently insufficient human clinical trial data available to establish a definitive timeline for tongkat ali's effects in people. The herb's mechanisms, including anti-estrogenic activity and potential modulation of Leydig cell function, are biological processes that generally require sustained supplementation rather than producing immediate results. Anecdotally, some users report noticing changes in energy or libido within a few weeks, but these reports lack rigorous clinical validation. Given the preliminary nature of the research, individuals should maintain realistic expectations and consult a healthcare provider to monitor any relevant biomarkers such as testosterone levels during supplementation.

### Can tongkat ali help with bone health in men?

Emerging preliminary research suggests tongkat ali may offer supportive benefits for male bone health, potentially addressing osteoporosis risk without the adverse effects associated with some hormonal therapies. Since testosterone plays a key role in maintaining bone mineral density in men, tongkat ali's potential testosterone-supporting mechanisms could indirectly benefit skeletal health. Additionally, its anti-inflammatory properties via NF-κB inhibition may help reduce bone-degrading inflammatory processes. However, this evidence is limited to early-stage studies, and tongkat ali cannot currently be recommended as a primary intervention for osteoporosis without stronger human clinical trial evidence.

### What is the recommended dosage of tongkat ali extract?

Specific clinically validated human dosage ranges for tongkat ali have not been firmly established in the available research literature. Standardised extracts are commonly characterised to contain 20% eurycomanone and 4% additional quassinoids, which helps ensure consistent potency across products. Because dosing guidance remains unclear and the herb influences hormonal pathways, self-dosing without professional oversight carries potential risks. It is strongly advised to consult a qualified healthcare provider before beginning supplementation. They can help determine an appropriate starting dose based on your individual health status, goals, and any medications or conditions that may be relevant.

### Can I take tongkat ali with testosterone replacement therapy (TRT)?

Combining tongkat ali with testosterone replacement therapy (TRT) is an area lacking specific clinical safety data. Tongkat ali works through anti-estrogenic mechanisms and potential modulation of endogenous testosterone production via Leydig cells, while TRT introduces exogenous testosterone. Co-administration could theoretically amplify hormonal imbalances or interfere with the body's feedback regulation of the hypothalamic-pituitary-gonadal axis. Additionally, NF-κB pathway modulation may interact with other aspects of TRT physiology. Given these potential overlapping hormonal effects and the absence of interaction studies, you should always consult your prescribing physician or endocrinologist before adding tongkat ali to a TRT regimen.

### Does tongkat ali actually boost testosterone levels in men?

Tongkat ali contains eurycomanone and canthin-6-one alkaloids that may support testosterone production through anti-estrogenic mechanisms, including reduced estrogen receptor binding and enhanced luteinizing hormone sensitivity in Leydig cells. These proposed mechanisms are supported by mechanistic and in vitro studies. However, robust human clinical trial data with standardized dosing is currently limited, so while the biological rationale is plausible, definitive conclusions about testosterone elevation in healthy men await larger randomized controlled trials. Consult a healthcare provider before use.

### What are the side effects of taking tongkat ali supplements?

Comprehensive human safety data for tongkat ali is limited, as most available research consists of in vitro and mechanistic studies rather than large-scale clinical trials. Because its active compounds, eurycomanone and canthin-6-one, demonstrate anti-estrogenic activity, individuals with hormone-sensitive conditions should exercise caution. Potential interactions with medications affecting hormone metabolism are theoretically possible. Until more robust human safety data is available, consulting a healthcare provider before use is strongly recommended, particularly for those on existing medications or with underlying health conditions.

### Can tongkat ali help with male fertility and sperm quality?

Tongkat ali's active alkaloids have been studied for their potential to support spermatogenesis through anti-estrogenic activity and modulation of steroidogenesis pathways in Leydig cells. These mechanisms suggest a plausible role in supporting male reproductive health. Preliminary mechanistic evidence is encouraging, but the available research dossier lacks large-scale human clinical trials confirming improvements in sperm count, motility, or morphology. Men experiencing fertility concerns should consult a reproductive health specialist rather than relying solely on supplementation.

### Is tongkat ali an anti-inflammatory supplement?

Tongkat ali demonstrates anti-inflammatory potential through inhibition of the NF-κB signalling pathway by its key bioactive compounds, eurycomanone and canthin-6-one alkaloids. NF-κB is a central regulator of inflammatory cytokine production, so its inhibition may reduce downstream inflammatory activity. The extract has also been shown to modulate cytokine production in preliminary in vitro studies. While these findings are mechanistically meaningful, human clinical evidence confirming anti-inflammatory effects at supplemental doses is not yet established from the available research.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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