A study of young men in China found that administering a single dose of testosterone made participants less sensitive to angry faces, but it had no effect on their sensitivity to fearful expressions. The research was published in Psychoneuroendocrinology. Testosterone is a steroid hormone primarily produced in the testes in males and, to a lesser extent, in the ovaries and adrenal glands in females. It plays a critical role in the development of male reproductive tissues, such as the testes and prostate, as well as promoting secondary sexual characteristics like increased muscle mass and body …