Lock yang is a kind of traditional Chinese medicine, also known as the ground hair ball, its taste is sweet, warm. It belongs to the liver, kidney and large intestine meridians, and has the function of tonifying the kidney and helping the yang, moistening the intestines and laxatives. It can be used for treating cold and fear of cold, impotence and premature ejaculation, impotence of the lower limbs, weakness of the limbs, infertility, etc., which are caused by the deficiency of kidney yang and the insufficiency of kidney essence.

It can also be used for the treatment of deficiency of essence and blood, blood deficiency and fluid deficiency resulting in dry stools, defecation, constipation in the elderly. It is not suitable for patients who suffer from diarrhea caused by spleen deficiency, or constipation caused by stomach heat and viscera solidity