Inclusion Criteria:

1. Women 40-60 years of age.
2. Must be postmenopausal (0.5~5 years post cessation of menses) or ovariectomized or hysterectomy women who have documented elevated Follicle Stimulating Hormone FSH (>30mIU/ml) with low serum estradiol (<20 pg/ml).
3. The lumbar vertebral BMD T-score is between -1and -2.5 SD.
4. The body mass index (BMI) is between 19 and 29 kg/m2.
5. Completed informed consent and signed informed consent form.

Exclusion Criteria:

1. Have diseases which may affect bone metabolism, e. g., hyper-or hypocalcemia, hyperthyroidism, osteogenesis imperfecta, malignancy, chronic gastrointestinal disease, extensive Paget's disease, alcoholism, and renal or hepatic impairment.
2. Has taken drug therapy for osteoporosis within the previous six months (excluding calcium supplements) prior to this study.
3. Chronic or continued use of hormone replacement drugs or medications that may affect bone calcium metabolism, for example, phosphate-binding antacids, many diuretics, adrenal or anabolic steroids, heparin, anticonvulsants, fluoride in excess of 1 mg/day and supplements of vitamin D or A in excess of RDAs.
4. Vitamin D deficiency (1, 25-dihydroxyvitamin D is lower than the normal range of: 25.1 pg/mL ~ 66.1 pg/mL).
5. Patients with fracture history.
6. Patients who can not promise to keep from taking stimulant drinks (for example, coffee, tea, alcoholic drink, and Coke) that may cause loss of bone calcium, during the study period.