Bone Solid is a unique formula designed to support healthy bone structure, employing benefits from clinically studied nutrients such as MCHA (microcrystalline hydroxyapatite) and FruiteX B (a.k.a. calcium fructoborate). 90% of the body's calcium is stored in the bones in the form of calcium phosphate. MCHA by structure is calcium phosphate, which is a form of calcium that is closest to the body's own natural bone composition. Clinical studies suggest that this form of calcium is the most effective for overall bone support. MCHA has the perfect ratio of calcium to phosphorus which is required for bone rehabilitation.