Disclosed herein are a composition and a method for increasing calcium absorption, increasing bone mass and/or for treating osteoporosis, in which use of ferrous amino acid chelate is involved therein.本發明揭示用於提高鈣吸收(calcium absorption)、增加骨質(bone mass)和/或用於治療骨質疏鬆(osteoporosis)的組成物與方法,其中涉及胺基酸亞鐵螯合物(ferrous amino acid chelate)的使用。