Testosterone is a hormone secreted by the adrenal glands, testes and ovaries. It contributes to muscle mass, strength and endurance, decreased fat, increased exercise tolerance, enhancement of well-being and psychological status. Testosterone protects against cardiovascular disease, hypertension and body fat and arthritis. It leads to improved lean muscle mass, increased bone density, decrease in cholesterol, improved skin tone, improved healing capacity, and increased libido and sexual performance. It prolongs the quality of life by decreasing the diseases of aging, as does performance estrogen in the female. Testosterone is also present and extremely important in the female as well as the male, making supplementation absolutely recommended for men and women.