Estrogen, also known as estrogen and female hormone, is one of the major female hormones. It is the hormone that promotes the maturation of the female sex organs and the appearance of secondary sexual characteristics, and maintains normal libido and reproductive function. There are two major groups of hormones (both steroid hormones), namely estrogen (also known as estrogen) and progesterone. Estrogen is mainly secreted by follicular cells of the ovaries and other hormones (testes, placenta and adrenal glands, also secrete estrogen), mainly estradiol. It is inactivated in the liver, converted to estriol and estrone, and combined with glucuronide and excreted in the urine. In contrast, the placenta secretes large amounts of estriol during pregnancy. Estrogen is the sex hormone of female vertebrates, and estrus hormone secreted by the ovaries has the effect of promoting the appearance of secondary sexual characteristics. Mammals also change the filter cells after ovulation into the corpus luteum and secrete luteinizing hormone called secondary estrogen, which has the function of controlling pregnancy and lactation. The effects of decreased estrogen on women: 1. skin laxity, wrinkles and spots; 2. breast laxity and sagging, body fat; 3. atrophy of reproductive organs, decreased secretions, weak acidity to neutrality, susceptibility to various inflammatory diseases, decreased sexual response, loss of bone calcium, osteoporosis; 4. emotional changes, excitement, and difficulty in controlling. Head and face hot flashes, excessive sweating, tiredness, depression and suspicion, dreamy and insomnia, early menopausal symptoms.