Bone Builder with Magnesium Glycinate features certified microcrystalline hydroxyapatite concentrate (MCHC), a whole bone concentrate composed of calcium, numerous other minerals, and organic factors that naturally comprise bone. Also featuring added magnesium, this formula is an excellent supplement for anyone desiring to build and maintain strong, healthy bones. Bone Builder with Magnesium Glycinate is: Extremely low in lead and other heavy metals. Cold processed to help preserve the organic components. Made only of premium quality, edible grade MCHC.