Tongkat Ali (Eurycoma Longifolia)
Tongkat ali is a Southeast Asian root extract that raises free testosterone by lowering SHBG and cortisol. The LJ100 standardised extract has the strongest clinical backing at 200–400mg per day.
What Is Tongkat Ali?
Tongkat ali (Eurycoma longifolia), also known as Malaysian ginseng or longjack, is a flowering plant native to the rainforests of Malaysia, Indonesia, and Thailand. The root has been used in traditional Southeast Asian medicine for centuries as a tonic for vitality, energy, and male reproductive health.
The active compounds — eurypeptides, quassinoids (particularly eurycomanone), and glycosaponins — are responsible for the hormonal and adaptogenic effects documented in modern research. As a tongkat ali supplement in India, it has gained significant popularity among men seeking natural testosterone support alongside or as an alternative to ashwagandha.
Mechanism of Action
Eurycoma longifolia testosterone effects operate through three distinct pathways, making it mechanistically different from most other natural testosterone-supporting compounds:
- LH/FSH stimulation: Eurypeptides appear to stimulate the hypothalamic-pituitary-gonadal (HPG) axis, increasing luteinising hormone (LH) and follicle-stimulating hormone (FSH) secretion. Higher LH directly signals Leydig cells to produce more testosterone.
- SHBG reduction: Tongkat ali lowers sex hormone-binding globulin (SHBG), the protein that binds testosterone and renders it inactive. Reducing SHBG increases the fraction of free testosterone — the biologically active form that drives muscle protein synthesis, libido, and energy.
- Cortisol modulation: Quassinoids in tongkat ali inhibit cortisol release under stress. Since cortisol and testosterone compete for shared precursor pathways, lowering cortisol indirectly supports testosterone output — a mechanism shared with ashwagandha, though via different molecular targets.
Ashwagandha primarily reduces cortisol via HPA axis modulation, with testosterone benefits as a secondary effect. Tongkat ali directly targets the HPG axis (LH/FSH) and SHBG. For men with high SHBG and normal cortisol, tongkat ali is the stronger choice. For high-stress individuals with elevated cortisol, ashwagandha may be more effective. The two can be stacked — they act on complementary pathways.
Evidence Quality
The clinical evidence for tongkat ali is moderate and growing. Key studies include:
- Testosterone & SHBG: A 2012 RCT by Tambi et al. using 200mg/day of standardised water extract in men with late-onset hypogonadism showed a 46% improvement in testosterone levels, with 90.8% of participants returning to normal reference ranges after 1 month (PubMed 21671978)
- Cortisol & stress: Talbott et al. (2013) demonstrated a 16% reduction in cortisol and 37% improvement in tension profile scores in moderately stressed adults taking 200mg/day for 4 weeks
- Body composition: A 5-week supplementation study in active men showed significant increases in lean body mass and arm circumference with 100mg/day of LJ100 extract
- 2022 meta-analysis: A systematic review of 9 RCTs confirmed statistically significant increases in total testosterone across pooled data, though effect sizes varied by population and extract standardisation
Limitations: most trials are small (30–60 participants), short-duration (4–12 weeks), and predominantly conducted in Malaysian populations. More large-scale, long-duration RCTs are needed — particularly in Indian cohorts — to strengthen the evidence base.
Dosing for India
The most clinically validated form is the LJ100 extract (also marketed as Physta), standardised to 40% glycosaponins and 22% eurypeptides. This is the extract used in the majority of published RCTs.
| Parameter | Recommendation |
|---|---|
| Extract type | LJ100 / Physta (standardised water extract) |
| Daily dose | 200mg (maintenance) — 400mg (loading or higher need) |
| Timing | Morning with food; can split 200mg AM + 200mg PM |
| Cycle | 8–12 weeks on, 2–4 weeks off |
| Avoid | Unstandardised root powder (variable potency, heavy metal risk) |
| India availability | Available via imported brands; verify LJ100 or equivalent standardisation on label |
Start with 200mg LJ100 extract daily in the morning with food. After 4 weeks, increase to 400mg if tolerated and testosterone response is suboptimal. Run baseline labs (total testosterone, free testosterone, SHBG, cortisol) before starting and retest at 8–12 weeks.
Biomarker Connections
Tongkat ali's effects are best tracked through a focused panel of hormonal biomarkers:
- Total testosterone: Expected increase of 15–40% depending on baseline levels and extract quality. Largest gains in men starting below 400 ng/dL.
- Free testosterone: Often shows a proportionally larger increase than total testosterone due to the dual effect of raising production and lowering SHBG. This is the more clinically meaningful marker for symptom improvement.
- SHBG: Expect a modest 10–20% reduction. Men with SHBG above 50 nmol/L are likely to see the greatest free testosterone benefit from tongkat ali supplementation.
- Cortisol: Morning serum cortisol reductions of 10–16% have been documented. This is a secondary benefit but contributes to the overall hormonal optimisation effect.
- DHEA-S: Some evidence suggests tongkat ali supports adrenal androgen output, though this is less well-studied than the testosterone pathway.
Frequently Asked Questions
Does tongkat ali really increase testosterone?
Yes, multiple RCTs confirm that standardised Eurycoma longifolia extract raises total and free testosterone. A 2022 meta-analysis of 9 RCTs found statistically significant increases in total testosterone. The primary mechanism is SHBG reduction and LH stimulation. Effects are strongest in men with mildly low or stress-suppressed testosterone.
What is the best tongkat ali dosage for testosterone?
The clinically studied dose is 200–400mg per day of a standardised extract such as LJ100 (40% glycosaponins, 22% eurypeptides). Most RCTs use 200mg daily in the morning with food. Higher doses of 400mg may be used as a 4–8 week loading phase before reducing to 200mg maintenance.
Tongkat ali vs ashwagandha — which is better for testosterone?
They work through different mechanisms and can be stacked. Tongkat ali directly lowers SHBG and stimulates LH, raising free testosterone. Ashwagandha primarily reduces cortisol, which indirectly supports testosterone. For men with high SHBG and normal cortisol, tongkat ali is the better choice. For high stress and elevated cortisol, ashwagandha may be more effective.
Is tongkat ali safe for long-term use?
Clinical trials up to 12 weeks show no significant adverse effects at 200–400mg daily of standardised extract. Liver and kidney markers remain stable in published safety data. Long-term data beyond 6 months is limited, so most practitioners recommend cycling 8–12 weeks on, 2–4 weeks off. Avoid unstandardised root powder products which may contain heavy metals.