What's the best treatment for pre menapausale women who are suffering from sever osteoporosis ?

Vit D3, ?Ca+2 ?Meds: Bone basically=cartilage hardened with Ca+2 & PO4-2 ions called hydroxyapatite. Vitamin D3 essential for Ca+2 absorption & getting it into bones. Check vitamin D3 level. If low supplement to >70 ng/ml range; possibly supplement dietary Ca+2 with dairy and/or supplements; Citracal one of the best. Bone stress also important (not enough to break), exercise (not low impact) Bisphosphonates an option.

Evaluation: premature menopause is a complex area for management, and will need evaluation to determine the cause for underlying osteoporosis. I would strongly recommend referral to an osteoporosis specialist