Eurycoma longifolia (Longjack)
Southeast Asian herb with evidence for supporting healthy testosterone levels, energy, and stress resilience.
Tongkat Ali is a flowering plant native to Southeast Asia, traditionally used as an aphrodisiac and energy tonic. Research shows it may support healthy testosterone levels, particularly in men with suboptimal levels or high stress. Also shows adaptogenic properties, helping manage cortisol and stress response.
May support natural testosterone production
Helps balance the stress hormone cortisol
How Tongkat Ali works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
200-400mg standardized extract
Can be taken without food
| Form | Type |
|---|---|
| 💊Standardized root extract (100:1 or 200:1) | Recommended |
| 🧪Root powder (requires higher doses) | Alternative |
Standardized extracts are more reliable. Look for products tested for heavy metals and contaminants.
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: 5 days on, 2 days off. Or 4 weeks on, 1 week off. Cycling may prevent tolerance.
Note: Some prefer taking in the morning due to potential energizing effects. Standardized to eurycomanone content (1-2%).
May increase total and free testosterone
Improved energy and reduced fatigue
Lower stress and improved mood
Avoid — affects hormones
Use with caution; may affect hormone levels
May have additive effects
May affect blood pressure
May affect blood sugar
Tip: Take in morning; reduce dose
Tip: Reduce dose
Tip: May be normal; reduce dose if uncomfortable
Both support testosterone and reduce cortisol
Enhanced hormonal support and stress management
Zinc is essential for testosterone production
Comprehensive testosterone support
Both support male hormonal health
Enhanced testosterone and vitality support
Different mechanisms for hormonal support
Enhanced energy and libido support
Commonly stacked for testosterone support via different mechanisms
Tongkat ali frees bound testosterone while fadogia increases LH signaling
Top studies from 15+ peer-reviewed papers
George A et al. • Phytotherapy research : PTR (2016)
“The numbers of total, naïve, and CD4(+) T cells were also higher in the TA group than those in P group (p < 0.05).”
Ye DN et al. • Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica (2024)
“This study aims to facilitate the compatible use and product development of Tongkat Ali while providing reference for introducing it as a new TCM resource and studying the TCM properties of ginseng plants abroad.”
Leisegang K et al. • Phytotherapy Research (2022)
“Tongkat Ali supplementation consistently elevated testosterone levels and improved physical function markers including grip strength and muscular endurance in aging men.”
Leisegang K et al. • Medicina (Kaunas, Lithuania) (2022)
“Although more research is required before its use in clinical practice, this may represent a safe and promising therapeutic option, particularly in hypogonadal men.”
Balasubramanian A et al. • The journal of sexual medicine (2019)
“Our investigation revealed that human studies evaluating the efficacy of ED-S ingredients are limited and have yielded no definitive findings of the effects on ED.”
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