Calcium citrate:
Calcium citrate is absorbed better within a nonacidic environment. This form of calcium is better for patients taking antacids such as H2 blockers (Pepcid, Zantac) and proton pump inhibitors (Prilosec, Protonix, Nexium). The content of elemental calcium in this form is slightly more than 20%. Again, the daily intake of calcium should be based upon how much elemental calcium the supplement contains and not the amount of total calcium citrate.
Calcium, bone mineral density, and osteoporosis:
Adequate calcium intake should be part of the treatment for osteoporosis. An ideal treatment regimen for osteoporosis supported by mainstream physicians and the study by Sosa et al consists of weight bearing exercise, adequate calcium intake, optimal vitamin D from sun or supplement, avoidance of smoking, abstaining from alcohol, assessment of bone mineral density and seeking medication options from the primary physician . (5)