Hair loss may be related to deficiency of vitamin A, vitamin B, vitamin D, etc., but it may also be related to diseases such as androgenetic alopecia, patchy baldness or systemic lupus erythematosus. 1. Vitamin A: It is a fat-soluble vitamin, which can help promote growth and reproduction, and maintain normal secretion of bones, epithelial tissues, vision and mucous epithelium. 2. Vitamin B: including B1, B2, B6, B12, etc., has the effect of promoting hair growth, usually women will have more serious hair loss after childbirth, you can take. 3. Vitamin D: belongs to the fat-soluble vitamins, can promote the absorption of calcium and phosphorus of the small intestinal mucosa cells, promote skin cell growth, differentiation and regulation of immune function. In addition to vitamin deficiency, hair loss may also be related to androgenetic alopecia, baldness or systemic lupus erythematosus. It is recommended that people with hair loss go to the hospital in a timely manner, under the guidance of a professional doctor, combined with the cause of the selection of suitable vitamins, avoid taking without authorization.