Deer antler powder is the fine powder of deer antler after grinding, its effects are to strengthen the muscles and bones, regulate Chong Ren, support sores and poisons, tonify kidney yang and essence and blood. It acts as a main treatment for kidney yang deficiency (deficiency of yang energy in the kidneys) and other conditions. Deer antler is a kind of traditional Chinese medicine for the young antlers with velvet of Sika deer, a genus of deer, with the effect of strengthening yang, tonifying qi and blood, benefiting the essence and marrow, and strengthening the tendons and bones. It can be used to treat fatigue, dizziness, darkness of the eyes, impotence of the waist and knees, impotence, coldness of the uterus, and leakage of menstruation (excessive menstruation or dribbling). Clinically, Deer Velvet Antler with Radix Rehmanniae Praeparata is used for impotence, spermatorrhea and infertility with cold uterus due to kidney deficiency; Deer Velvet Antler with Colla Corii Asini is used for insufficiency of liver and kidneys (weakness of liver and kidneys), excessive menstruation, and menstrual leakage; Deer Velvet Antler with Cistanches is used for insufficiency of kidney yang (lack of yang in kidneys), deficiency of essence and blood and weakness of sinew and bone; Deer Velvet Antler with Radix Angelicae Sinensis is used for insufficiency of liver and kidneys, deficiency of qi and blood, and menorrhagia. Deer antler with cinnamon is used for kidney yang deficiency. Deer antler adverse reactions, contraindications are not yet clear, the drug should be noted, yin deficiency and hyperactivity (deficiency of yin fluid, hyperactivity of yang) should not be taken. Before taking antler powder, it should be taken under the guidance of a traditional Chinese medicine practitioner, do not buy and use on your own to avoid delaying the condition.