Eurycoma longifolia · Longjack · Malaysian ginseng
400 mg · vegan · gluten-free · 60 caps
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Tongkat ali is a flowering plant native to Southeast Asia. Its root contains quassinoids including eurycomanone, which is considered the primary bioactive marker. Standardized extracts (1.5-2% eurycomanone by HPTLC) have been tested in multiple human RCTs for testosterone enhancement, stress reduction, and sexual function.
Eurycomanone appears to stimulate the hypothalamic-pituitary-gonadal axis, increasing luteinizing hormone (LH) release and subsequent testosterone synthesis in Leydig cells. It also reduces cortisol and may improve the testosterone:cortisol ratio — a marker of anabolic status. The effect is most pronounced in men with low or stress-suppressed baseline testosterone.
Men 30+ with low-normal testosterone, high stress, reduced libido, or athletes seeking natural anabolic support. Also relevant for men with age-related hypogonadism symptoms who prefer a botanical approach before considering TRT.
Avoid if you have hormone-sensitive conditions or are on testosterone replacement therapy without physician guidance. Very high doses may cause insomnia, anxiety, or elevated body temperature. Not for use by adolescents.
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✓ Morning dosing preferred due to potential stimulant effect; avoid evening use if insomnia occurs
✓ Take with breakfast to improve absorption and reduce GI upset
Eurycomanone appears to stimulate the hypothalamic-pituitary-gonadal axis, increasing luteinizing hormone (LH) release and subsequent testosterone synthesis in Leydig cells.
Each bar = one cited trial. Effect varies by methodology, dose, and population.
Adult males with low-normal testosterone (n≈57)
Normal testosterone range 300–1000 ng/dL (adult male).
25
→ 400 mg/day tongkat ali for 5 weeks increased total and free testosterone by 15% and 37% respectively in healthy senior men and women.
76
→ Men with low testosterone taking 200 mg/day standardized extract showed significant increases in total testosterone, free testosterone, and dehydroepiandrosterone.
63
→ 200 mg/day standardized extract for 4 weeks reduced cortisol by 16% and improved testosterone:cortisol ratio by 37% in moderately stressed adults.
B · Multiple RCTs in men and women show consistent increases in total and free testosterone, particularly in those with low baseline or high stress. Effect sizes are modest (15-37% increases), not supraphysiological. Long-term data beyond 5 weeks is limited.
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: See richResearch section. Multiple RCTs support cognitive and neuroprotective properties of Tongkat Ali (Eurycomanone).
How to use Tongkat Ali (Eurycomanone) specifically for Low energy — the right dose, timing, blood markers to track, and how to know if it is working.
A clinical evidence review of Tongkat Ali (Eurycomanone) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.
Everything you need to know about Tongkat Ali (Eurycomanone) — mechanism, dose, safety, buying guide for India, and what the research actually says.
SacredBod's longer take on Tongkat Ali (Eurycomanone) — context the structured blocks above don't capture.
Tongkat ali has emerged as the most credible herbal testosterone support option for men, largely because researchers have bothered to test it in randomized controlled trials using standardized extracts. Unlike most “T-boosters” that rely on a single small study or animal data, tongkat ali has a small but genuine human evidence base.
The 2012 Tambi study (Henkel et al.) enrolled 76 men with low testosterone (hypogonadism) and gave them 200 mg/day of a standardized water-soluble extract for one month. Total testosterone increased significantly, as did free testosterone and DHEA. This is one of the few herbal supplement studies that specifically targeted hypogonadal men — the population most likely to benefit.
The 2014 Henkel study extended this to healthy seniors (13 men, 12 women) using 400 mg/day for 5 weeks. Total testosterone rose 15% and free testosterone rose 37%. Notably, this was a physically active senior population, suggesting tongkat ali works beyond just correcting deficiency in sedentary men.
The 2011 Ismail study took a different angle, examining stress hormones in 63 moderately stressed adults. Four weeks of 200 mg/day standardized extract reduced cortisol by 16% and improved the testosterone:cortisol ratio by 37%. This is clinically meaningful because chronic stress suppresses testosterone via cortisol-mediated HPA axis inhibition.
The active compound in tongkat ali is eurycomanone, a quassinoid that is difficult to extract and present in trace amounts in raw root powder. Products labeled “tongkat ali 500 mg” without standardization may contain negligible eurycomanone. Look for:
Generic root powder is not clinically equivalent to standardized extract.
Tongkat ali does not produce supraphysiological testosterone levels. The increases seen in trials (15-37%) bring men from low-normal toward mid-normal range, not into bodybuilder territory. Men with already-optimal testosterone are unlikely to see meaningful increases. It is a restorative agent, not a supercharger.
Among herbal testosterone supplements, tongkat ali has the strongest human RCT evidence. Ashwagandha (KSM-66) has comparable trial support with the added benefit of stress reduction. Zinc and vitamin D are more fundamental — correcting deficiencies that suppress testosterone in the first place. DHEA is appropriate only for men with confirmed low DHEA-S. For most men over 35, a stack of tongkat ali + ashwagandha + zinc + vitamin D represents the most evidence-based natural approach.
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