Khonicheva NM, et al. Blood testosterone in rats: correlation of the level of individual anxiety and its impairment after "death threat". Neurosci Behav Physiol. 2008; 38: 985-9.
Spivak B, et al. Plasma testosterone levels in patients with combat-related posttraumatic stress disorder. Neuropsychobiology. 2003; 47: 57-60.
Goh VH, Tong TY. Sleep, Sex Steroid Hormones, Sexual Activities, and Aging in Asian Men. J Androl. 2009 Aug 14.
Reduction in circulating testosterone relates to exercise capacity in men with chronic heart failure. J Card Fail. 2009 Jun;15(5):442-50. Epub 2009 Feb 10.
Endurance training of moderate intensity increases testosterone concentration in young, healthy men. Int J Sports Med. 2009 Jul;30(7):489-95. Epub 2009 Mar 19.
Om A, Chung K. Dietary zinc deficiency alters 5 alpha-reduction and aromatization of testosterone and androgen and estrogen in rat liver. J Nutrition. 1996; 126: 842-48.
Kumar N, et al. Effect of different levels and sources of zinc supplementation on quantitative and qualitative semen attributes and serum testosterone level in crossbred cattle (Bos indicus x Bos taurus) bulls. Reprod Nutr Dev. 2006; 46: 663-75.
Zarkova S. [Steroid saponins of Tribulus terrestris L. have a stimulant effect on the sexual function]. Rev Port Ciencias Vet. 1984; 79: 117-126
Wu H, et al. Chemical and pharmacological investigations of Epimedium species: a survey. Prog Drug Res. 2003; 60: 1-57.
Kuang AK, et al. Effects of yang-restoring herb medicines on the levels of plasma corticosterone, testosterone and triiodothyronine. Zhong Xi Yi Jie He Za Zhi. 1989; 9: 737-8, 710.
Effects of the lipidosterolic extract of Serenoa repens (Permixon) on human prostatic cell lines. Prostate. 1996; 29: 219-30.
Comparison of finasteride (Proscar), a 5 alpha reductase inhibitor, and various commercial plant extracts in in vitro and in vivo 5 alpha reductase inhibition. Zhong Xi Yi Jie He Za Zhi. 1989; 9: 737-8.
Rhodes L, et al. Comparison of finasteride (Proscar), a 5 alpha reductase inhibitor, and various commercial plant extracts in in vitro and in vivo 5 alpha reductase inhibition. Prostate. 2006; 22: 43-51.
Koch E. Extracts from fruits of saw palmetto (Sabal serrulata) and roots of stinging nettle (Urtica dioica): viable alternatives in the medical treatment of benign prostatic hyperplasia and associated lower urinary tracts symptoms. Planta Med. 2001; 67: 489-500.
Chang YC, et al. Cytostatic and antiestrogenic effects of 2-(indol-3-ylmethyl)-3,3'-diindolylmethane, a major in vivo product of dietary indole-3-carbinol. Biochem Pharmacol. 1999; 58: 825-34.