Testosterone is a sexual steroid hormone of the androgen group that is produced by the testes in men and by the ovaries in women. It will be the main male sex hormone and an anabolic steroid. The concentration of testosterone in the blood plasma of men is ten times greater than that of women, while its daily production is 20 higher. Among others, testosterone is necessary for the normal development of spermatozoa and provides us with physical and mental energy. Did you know that falling in love decreases testosterone levels in men while increasing them in women?