Calcium citrate doesn't need stomach acid to be absorbed. Calcium supplements are better absorbed with meals. Calcium supplements are especially helpful to women who cannot tolerate dairy products. Our body also needs Vitamin D to help absorb calcium and, thereby, make the calcium more beneficial to our bones. Too much supplemental Vitamin D, however, can be harmful.
Vitamin D is a fat soluble vitamin which gets stored in body fat.
We should not exceed recommended daily levels. It can even help prevent fractures in women with established osteoporosis. There are several kinds and doses of ERT that are FDA-approved specifically for osteoporosis prevention and treatment. To get the full benefits of estrogen for our bones, experts recommend it be taken continually. Even if we're taking estrogen, we still need to get our appropriate amount of calcium.