"T. terrestris has consistently failed to increase testosterone levels in controlled studies.[1][2][3] It has also failed to demonstrate strength-enhancing properties.[4]"
^Brown GA, Vukovich MD, Reifenrath TA, Uhl NL, Parsons KA, Sharp RL, King DS (2000). "Effects of anabolic precursors on serum testosterone concentrations and adaptations to resistance training in young men". Int J Sport Nutr Exerc Metab 10 (3): 340-59. PMID 10997957.
^ Brown GA, Vukovich MD, Martini ER, Kohut ML, Franke WD, Jackson DA, King DS (2001). "Endocrine and lipid responses to chronic androstenediol-herbal supplementation in 30 to 58 year old men". J Am Coll Nutr 20 (5): 520-8. PMID 11601567.
^ Neychev VK, & Mitev VI. (2005). "The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men". J Ethnopharmacol 101 (1-3): 319-23. PMID 15994038.
^ Rogerson S, Riches CJ, Jennings C, Weatherby RP, Meir RA, Marshall-Gradisnik SM. (2007). "The Effect of Five Weeks of Tribulus terrestris Supplementation on Muscle Strength and Body Composition During Preseason Training in Elite Rugby League Players". J Strength Cond Res 21 (2): 348-53. PMID 17530942.