I found this on the internet. just typed in shilajit for osteoporosis and this popped up. I just pulled out the highlights, but there is more information there.

shilajit shows significant scientific promise for protecting against osteoporosis and slowing bone loss. A landmark 48-week human clinical trial published in Phytotherapy Research demonstrated that daily shilajit supplementation successfully preserved bone mineral density (BMD) in postmenopausal women with osteopenia (the precursor to osteoporosis). While the placebo group experienced progressive bone loss, women taking shilajit saw a dose-dependent stabilization and improvement in their hip and spine density.

If you are already taking standard prescription osteoporosis medications—specifically bisphosphonates like alendronate (Fosamax) or risedronate (Actonel)—you must exercise strict caution.