Testosterone has the functions of maintaining muscle strength and quality, bone density and intensity, refreshing and improving physical fitness. Testosterone can affect many body systems and functions, including blood production, calcium balance, bone mineralization, lipid metabolism, glucose metabolism and prostate growth. It is the main androgen and anabolic steroid. Both men and women have an important impact on health, including enhancing sexual desire, strength, immune function and fighting osteoporosis. According to statistics, the testosterone secretion of adult men is 20 times that of adult women. Testosterone is also an important reason why boys are aggressive, adventurous and eager to be the strongest, bravest and strongest man, which plays a vital role in the growth and development of boys.