Magnesium and Boron are way more importatnt than Calcium.
I prefer to get my Calcium from Green Leafy Veggies, Broccoli, etc.
I have read that supplementing with Magnesium will increase the bone density.
Ppl who supplement with Calcium are at risk of developing gallstones, kidney stones, hardening of arteris and arthritis. Its easy to overdose on inorganic Calcium .