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TONGKAT 100: the research 

TONGKAT 100: the research 


Scroll down to view the references for the specific studies done on this 100:1 Tongkat extract and learn more about what makes it such an extraordinary product.

Malaysia’s most versatile adaptogen.  

Click here to view the actual lab report on this patented Tongkat extract, which includes testing for both safety and potency.

LJ100® is the most researched Tongkat Ali in the world.  23 studies have demonstrated its ability to support:

  • Healthy hormone production
  • Physical and mental energy
  • Enhanced athletic performance
  • Healthy mood
  • Optimal stress response
  • Healthy cortisol levels

Note also that Indonesian Tongkat Ali does not have specific clinical research behind it, and thus current evidence points to Malaysian Tongkat as the clear choice.  Click here to learn more.


Hamzah, S. and Yusuf, A. (2002) A preliminary study on the anabolic effect of Eurycoma longifolia Jack. 12 Commonwealth International Sport Conference 2002.

Hamzah, S. and Yusuf A. (2003) The ergogenic effects of Eurycoma longifolia Jack: A pilot study. British Journal of Sports Medicine (2003).BASEM Abstract 37:465-466.

Mohd. Tambi, M.I (2005) Standardized water soluble extract of Eurycoma longifolia (LJ100) on men’s health. Free Communications- F07. International Journal of Andrology 2005. Vol. 28(Suppl 1):25-44.

Talbott, S., Talbott, J., Negrete, J., Jones, M., Nichols, M., and Roza, J. (2007) Effect of Eurycoma longifolia extract on anabolic balance during endurance exercise. J. Supplement Watch, Inc.

M.Tambi, M.I. (2009) Nutrients and Botanicals for Optimizing Men’s Health: Examining the Evidence for Eurycoma longifolia Jack, the Malaysian Ginseng in Men’s Health. Asian Journal of Andrology 2009: 11 (5 suppl): 25-95

Md. Yusof, S., Zakaria, Z., Abdul Hamid Karim, A., Kamaruddin, N.A. and Abdul Kadir, A. (2009) Effects of strength training and Tongkat Ali (Eurycoma longifolia) supplementation on strength and muscle size in middle-aged women. 4th Asia-Pacific Conference on Exercise and Sport Science % 8th International Sports Science Conference 2009

Mohd. Tambi, M.I. and Imran, K. (2010). Asian Journal of Andrology (2010). 12:376-380,

Mohd. Tambi, M.I., Imran, M.K. and Henkel, R.R. (2011) Andrologia (Jun 15, 2011)

Ismail, S.B., Wan Mohammad, M.Z., George, A., Nik Hussain, N.H., Musthapa, Z.M. and Eckehard, L. (2012) Randomized Clinical Trial on the Use of PHYSTA Freeze-Dried Water Extract of Eurycoma longifolia for the Improvement of Quality of Life and Sexual Well-Being in Men. Evidence-Based Complementary and Alternative Medicine, vol. 2012, Article ID 429268, 10 pages, 2012.

George, A., Eckehard, L. and Ismail, S.B. (2013) The Eurycoma Longifolia Freeze-Dried Water Extract- Physta® Does Not Change Normal Ratios of Testosterone to Epitestosterone in Healthy Males. Journal of Sports Medicine & Doping Studies 2013, 3:127

Talbott, S.M., Talbott, J.A., George, A. and Pugh, M. (2013) Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. Journal of the International Society for Sports Nutrition 2013. 2013 May 26;10(1):28.

Henkel, R.R., Wang, R., Bassett, S.H., Chen, T., Liu, N., Zhu, Y. and Mohd. Tambi, M.I. (2013) Tongkat Ali as a Potential Herbal Supplement for Physically Active Male and Female Seniors – A Pilot Study. Phytotherapy Research.

Udani, J.K., George, A., Musthapa, M., Pakdaman, M.N. and Abas, A. (2014) Effects of a Proprietary Freeze-Dried Water Extract of Eurycoma longifolia (Physta) and Polygonum minus on Sexual Performance and Well-Being in Men: A Randomized, Double-Blind, Placebo-Controlled Study. Evidence- Based Complementary and Alternative Medicine; vol 2014, Article ID 179529

Chen, C.K., Wan Mohamad, W.M.Z., Ooi, F.K., Ismail, S.B., Abdullah, M.R. and George, A. (2014) Supplementation of Eurycoma longifolia Jack Extract for 6 Weeks Does Not Affect Urinary Testosterone: Epitestosterone Ratio, Liver and Renal Functions in Male Recreational Athletes. International Journal of Preventive Medicine. Jun 2014; 5(6): 728–733.

George, A., Suzuki, N., Abas, A., Mohri, K., Utsuyama, M., Hirokawa, K. and Takara, T. (2016) Immunomodulation in Middle-Aged Humans Via the Ingestion of Physta® Standardized Root Water Extract of Eurycoma longifolia Jack—A Randomized, Double-Blind, Placebo-Controlled, Parallel Study. Phytotherapy Research Apr;30(4):627-35.

George, A., Udani, J., Zainal Abidin, N. and Yusof, A. (2018) Efficacy and safety of Eurycoma longifolia (Physta®) water extract plus multivitamins on quality of life, mood and stress: a randomized placebo-controlled and parallel study. Food & Nutrition Research 2018; 62:1374

Chan, K. Q., Stewart, C., Chester, N., Hamzah, S. H., & Yusof, A. (2021). The effect of Eurycoma Longifolia on the regulation of reproductive hormones in young males. Andrologia, 53(4), e14001.


Chinnappan, S. M., George, A., Pandey, P., Narke, G., & Choudhary, Y. K. (2021). Effect of Eurycoma longifolia standardised aqueous root extract-Physta® on testosterone levels and quality of life in ageing male subjects: a randomised, double-blind, placebo-controlled multicentre study. Food & nutrition research, 65, 10.29219/fnr.v65.5647.


Leitão, A. E., Vieira, M., Pelegrini, A., da Silva, E. L., & Guimarães, A. (2021). Maturitas, 145, 78–85.


Leitão, A. E., Vieira, M., Gomes, D. A., Boing, L., Pelegrini, A., Luiz, E., & Guimarães, A. (2021). Complementary therapies in clinical practice, 42, 101301.


M Chinnappan, S., George, A., Ashok, G., & Choudhary, Y. K. (2020). BMC complementary medicine and therapies, 20(1), 31.


Chinnappan, S. M., George, A., Evans, M., & Anthony, J. (2020). Food & nutrition research, 64, 10.29219/fnr.v64.3665.