Use of chemical ingredients in Cynomorium as phytoestrogen is provided by the present invention. Particularly, use of Cynomorium, extracts of Cynomorium, or at least one ingredient chosen from chrysophanol, emodin, catechin, (−)-epicatechin-3-O-gallate, naringenin-4′-O-glucopyranoside, and phlorizin, in manufacturing medicaments for treating and/or preventing diseases related to insufficient of estrogen secretion in mammal (for example, human), or use in manufacturing medicaments used as phytoestrogens is provided by the present invention. The extracts of Cynomorium, compositions containing extracts of Cynomorium or active ingredients thereof, and methods of treating and/or preventing diseases related to insufficient of estrogen secretion are also provided by the present invention. According to the present invention, Cynomorium, extracts of Cynomorium, active ingredients thereof may be used to treat and/or prevent menopausal syndrome, osteoporosis, degenerative osteoporosis, cardiovascular and cerebrovascular diseases and breast cancer.
