The present disclosure relates to formulations comprising synergistic combination of highly bioavailable calcium sources along with key absorption co-factors and complementary nutrients to provide a comprehensive calcium formula with superior absorption and bone health benefits. In an aspect, the present disclosure provides a composition for building bone mass in a subject, wherein the composition can include a unit dosage mixture of: 300 mg of calcium, on an elemental basis, in the form of calcium citrate malate, calcium bisglycinate and calcium tribasic phosphate 25 mcg of vitamin K2-7 200 IU of vitamin D3 70 mg of phosphorous on an elemental basis 150 mg of magnesium on an elemental basis and 5 mg of zinc on an elemental basis.
