Science-Backed Health Benefits of Tongkat Ali

What is Tongkat Ali?

Tongkat Ali, scientifically known as Eurycoma longifolia, is a herbal remedy derived from the roots of a green shrub tree native to Southeast Asia. For centuries, traditional medicine practitioners have utilized these roots to treat ailments ranging from fevers to fatigue. Modern science has begun to analyze the plant’s active compounds, such as quassinoids and alkaloids, to understand their physiological effects on the human body. Research increasingly suggests that this herbal extract acts as a potent adaptogen, helping the body manage physical and chemical stress while supporting hormonal balance.

1. Supports Healthy Testosterone Levels

Maintaining optimal hormonal balance is a primary reason many individuals seek out this supplement. Research indicates that Tongkat Ali may effectively restore serum testosterone levels in men suffering from hypogonadism (low testosterone). A study published in PubMed found that daily supplementation significantly increased total testosterone levels in men with late-onset hypogonadism, helping to alleviate symptoms associated with androgen deficiency ¹ Furthermore, additional clinical trials have demonstrated that specific standardized extracts of the root can improve testosterone concentrations in ageing males, suggesting it may serve as a natural alternative for managing age-related hormonal decline ²

2. Enhances Male Fertility and Sperm Quality

Infertility affects a significant portion of the male population, often due to poor sperm motility or concentration. Scientific investigations have highlighted the potential of Eurycoma longifolia to improve these parameters. A review of its pharmacological effects notes that key bio-compounds in the root, such as eurycomanone, appear to stimulate spermatogenesis and improve overall fertility profiles ³ While ongoing clinical trials continue to assess the full scope of its efficacy for sperm quality ⁴ current evidence supports its traditional reputation as a pro-fertility agent.

3. Reduces Stress and Cortisol Levels

Chronic stress disrupts the body’s hormonal equilibrium, often leading to elevated cortisol levels which can suppress immune function and testosterone. One of the most compelling studies on this herb involved moderately stressed adults who took a standardized root extract for four weeks. The results, published in the Journal of the International Society of Sports Nutrition, showed a significant 16% reduction in salivary cortisol levels and a 37% increase in testosterone status ⁵ This demonstrates the herb’s capacity to act as an adaptogen, shielding the body from the detrimental biological effects of “modern” chronic stress ⁶

4. Improves Libido and Sexual Function

Sexual health is closely tied to psychological well-being and hormonal markers. Clinical studies involving healthy men have shown that supplementation can lead to improvements in erectile function and overall sexual satisfaction. A randomized, double-blind study found that a 12-week regimen of Eurycoma longifolia combined with antioxidants significantly enhanced scores on the Sexual Health Inventory for Men compared to a placebo ⁷ Additionally, research combining the supplement with concurrent training exercises observed marked improvements in erectile function in men with androgen deficiency ⁸

5. Increases Muscle Strength and Athletic Performance

Athletes and older adults often look for natural ways to preserve muscle function and physical capacity. Evidence suggests that the ergogenic (performance-enhancing) properties of Tongkat Ali may be beneficial for muscular force. A pilot study involving physically active seniors demonstrated that 400 mg of the extract daily for five weeks resulted in significant increases in muscular force and handgrip strength ¹ While some research on body composition remains mixed, the data on strength improvement, particularly in older populations, points to its utility in supporting physical function ⁹

6. Boosts Mood and Mental Well-being

Beyond physical performance, this root extract appears to influence psychological states, likely due to its cortisol-lowering effects. In the same study that analyzed stress hormones, researchers used the Profile of Mood States (POMS) to evaluate psychological parameters. They discovered that participants taking the supplement experienced significant reductions in tension (-11%), anger (-12%), and confusion (-15%) ⁶ These findings suggest that the herb may effectively alleviate common symptoms of psychological stress and improve overall mood states ¹⁰

7. Improves Body Composition and Lean Muscle Mass

Achieving a healthy ratio of lean muscle to body fat is a common health goal that Tongkat Ali may support. Some studies have indicated that the herb can help increase fat-free mass. For instance, research highlighted in a review of ergogenic effects noted that specific dosing protocols (100 mg/day) were associated with increases in fat-free mass and muscle size over a five-week period ¹¹ Although some trials have found equivocal results regarding fat loss alone, the combination of strength training and supplementation appears to offer the most promise for improving body composition ¹²

8. Potentially Supports Bone Density

As hormone levels decline with age, the risk of osteoporosis and bone weakness increases, particularly in men with low testosterone. Preliminary research using animal models suggests that Eurycoma longifolia may help prevent bone calcium loss. A study on androgen-deficient rats found that the extract upregulated the expression of osteoprotegerin, a protein critical for bone density, and reduced markers of bone resorption ¹³ While human trials are still needed to confirm this benefit explicitly, these findings indicate a potential role for the herb in maintaining skeletal health.

Conclusion

Current scientific literature supports the use of Tongkat Ali for various health applications, particularly regarding hormonal balance, stress reduction, and sexual health. While it is not a cure-all, the evidence from reputable databases like PubMed and ResearchGate validates many of its traditional uses. Individuals interested in this supplement should consult healthcare providers to ensure safety and appropriate dosing.