Testosterone supplementation needs to be used with caution. A clear diagnosis of androgen deficiency requires testosterone supplementation, which should not be self-administered, but should be administered under the supervision of a physician, and testosterone levels need to be monitored during the course of the medication. Testosterone supplementation is limited to patients with a definite diagnosis of primary or secondary hypogonadism. It maintains male secondary sexual characteristics and promotes male growth and development of the sex organs. Clinical application of testosterone supplementation needs to be under the guidance of a professional endocrinologist to prevent adverse reactions. Testosterone supplementation should not be used as a nutrient or tonic, because testosterone is a drug that is used to treat diseases, and should be used as prescribed by a doctor.