Tongkat Ali
testosterone
Tongkat ali (Eurycoma longifolia) is a Southeast Asian root used for centuries as a tonic for vitality and male sexual health. Modern research suggests it may help free testosterone from sex hormone-binding globulin (SHBG), the protein that locks testosterone in an inactive state. It also appears to lower cortisol, based on preliminary research.
We use a 200:1 concentrated extract — meaning 200 parts of raw root produce 1 part of finished extract. That concentration ensures meaningful levels of eurycomanone and other quassinoids, the active compounds behind tongkat ali's effects.
The statements on this page have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Tongkat Ali Benefits — What Studies Found
Most of your testosterone is locked up, bound to proteins your body can’t use. Tongkat ali may help free it.
Testosterone Restoration
Normal T (Open-Label, Low-T Men)Stress Hormone Rebalancing
Salivary T (Men & Women)Cortisol Reduction
CortisolWhy a 200mg (200:1 extract) dose of Tongkat Ali
Dosing tongkat ali is complicated because extract ratios vary widely. Our 200mg of 200:1 extract is equivalent to 40g of raw root material. Clinical studies showing benefits typically use 100-400mg of concentrated extract.
- Mid-Range Clinical Dose 200mg of concentrated extract falls within the 100-400mg range used in positive human studies.
- 200:1 Concentration Equivalent to 40g of raw root, ensuring meaningful levels of eurycomanone and other active quassinoids.
- Complements the Stack Works through SHBG and HPG axis pathways that differ from the other testosterone-supporting ingredients.
- Research-Matched Potency The extract ratio matters more than raw weight, and ours aligns with concentrated forms used in published trials.
Important: Not all tongkat ali extracts are equal. Lower concentration products (10:1, 50:1) require higher doses to deliver equivalent active compounds. Our 200:1 extraction ensures meaningful amounts of eurycomanone and other active quassinoids.
Clinical Dose Range
Clinical studies use 100–400mg of concentrated extract. Our 200mg of 200:1 extract delivers meaningful eurycomanone content.
Most of your testosterone is locked up, bound to proteins. Tongkat ali works to free it — so it actually reaches the receptor.
01
Testosterone in Aging Men
Tambi MI, et al. (2012). Andrologia.
Source
Testosterone in Aging Men
Tambi MI, et al. (2012). Andrologia. Source
In an open-label study (no placebo control) of late-onset hypogonadal men, tongkat ali supplementation brought testosterone to normal levels in 90.8% of participants (up from 35.5% at baseline) and normalized Aging Male Scale scores in 71.7% (up from 10.5%).
02
Stress Hormones and Mood
Talbott SM, et al. (2013). Journal of the International Society of Sports Nutrition.
Source
Stress Hormones and Mood
Talbott SM, et al. (2013). Journal of the International Society of Sports Nutrition. Source
A study in moderately stressed adults (32 men, 31 women) found that tongkat ali supplementation significantly improved salivary testosterone (+37%) and cortisol (−16%) vs placebo over 4 weeks, along with improved mood state. Note: testosterone was measured via salivary assay (not serum) in a mixed-sex sample.
03
Sexual Function
Ismail SB, et al. (2012). Evidence-Based Complementary and Alternative Medicine.
Source
Sexual Function
Ismail SB, et al. (2012). Evidence-Based Complementary and Alternative Medicine. Source
A 12-week randomized controlled trial in 109 men found that tongkat ali extract (300mg/day) significantly improved erectile function scores and sexual libido compared to placebo, with a 14% improvement in libido by week 12. Note: this study used 300mg/day; RBRN includes 200mg.
04
Potential Anti-Estrogenic Effects
Thu HE, et al. (2017). Chinese Journal of Natural Medicines.
Source
Potential Anti-Estrogenic Effects
Thu HE, et al. (2017). Chinese Journal of Natural Medicines. Source
Some research suggests tongkat ali may have anti-estrogenic activity, potentially through competitive binding or enzyme modulation, though this requires further investigation.
Published Research
32 studiesEvery claim we make is grounded in peer-reviewed research. Tap any study to read the abstract.
Our Assessment: Tongkat Ali
Centuries of traditional use backed by modern studies showing testosterone and cortisol improvements. Study quality varies, and effects may be more pronounced in stressed or low-testosterone men.
- Traditional use spanning centuries supports safety at typical doses
- Multiple studies show improvements in testosterone parameters
- Effects on stress hormones (cortisol reduction) are documented
- Sexual function improvements are observed in several studies
- The 200:1 standardization ensures potency
- Exact mechanisms aren’t fully established
- Study quality is variable—some lack rigor
- Optimal dosing and duration aren’t standardized
- Effects may be more pronounced in hypogonadal/stressed individuals
- Long-term studies are limited
How Tongkat Ali Fits the Formula
No ingredient works alone. Tongkat Ali was chosen because it amplifies — and is amplified by — specific formula partners.
Ashwagandha
Both herbs show cortisol-lowering effects. The combination may provide reinforced support for stress adaptation and the hormonal environment where testosterone thrives.
Fenugreek
Tongkat ali may work through SHBG and HPG axis effects; fenugreek through aromatase inhibition. Different mechanisms provide complementary support for testosterone balance.
Zinc
Zinc is required for testosterone synthesis. Tongkat ali may help optimize how that testosterone is utilized (free vs. bound). Foundation plus optimization.
Safety and Precautions
Always consult with a healthcare professional before starting any new dietary supplement, especially if you have an existing medical condition or take prescription medications.
