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📈Scientific Evidence: Tongkat Ali & Testosterone

Tongkat Ali (Eurycoma longifolia) has gained global attention for its potential to support male health and naturally boost testosterone levels. Below is a summary of key clinical studies and mechanisms behind its effectiveness.

🔬 Human Clinical Studies

1. Boosting Testosterone in Men With Low Levels

A placebo-controlled study by Tambi et al. (2012) showed that 200 mg/day of Tongkat Ali extract over 4 weeks significantly restored testosterone in men with late-onset hypogonadism.

✅ Result: 90% of participants had normalized testosterone levels.

2. Stress-Related Testosterone Suppression

In a 2013 study (Talbott et al.), 63 participants were given 200 mg/day of standardized extract for 4 weeks.

✅ Result: Testosterone increased by 37%, cortisol decreased by 16%.

3. Improved Semen Quality and Hormone Levels

In a study published in the Asian Journal of Andrology (2003), infertile men took Tongkat Ali for 3 months.

✅ Result: Increased sperm quality and testosterone. 11.6% achieved pregnancy.

🧪 Mechanisms of Action

Increases free testosterone: By lowering SHBG (Sex Hormone-Binding Globulin)
Stimulates LH (Luteinizing Hormone): Encourages the body’s natural production of testosterone
Reduces cortisol: Helps balance the testosterone-to-cortisol ratio
Enhances DHEA levels: Supports androgen precursor hormones

📊 Summary Table of Studies

Study	Population	Dosage	Duration	Key Outcomes
Tambi et al. (2012)	Men with late-onset hypogonadism	200 mg/day	4 weeks	90% restored testosterone levels
Talbott et al. (2013)	Healthy, stressed adults	200 mg/day	4 weeks	+37% testosterone, −16% cortisol
Asian J. Andrology (2003)	Infertile men	Undisclosed	3 months	Improved sperm and 11.6% pregnancy rate

📚 References

Tambi, M. I. B. M., Imran, M. K., & Henkel, R. (2012). Eurycoma longifolia Jack in managing idiopathic male infertility. *Evidence-Based Complementary and Alternative Medicine*, 2012.
Talbott, S. M., Talbott, J. A., George, A., & Pugh, M. (2013). Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. *Journal of the International Society of Sports Nutrition*, 10(1), 28.
Ang, H. H., & Sim, M. K. (2003). Eurycoma longifolia increases sexual motivation in sexually naive male rats. *Archives of Pharmacal Research*, 26(5), 421-424.

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