In addition to calcium , supplements that are promoted as adjuvants for maintaining bone mass integrity include magnesium and boron.
Magnesium acts by aiding and improving gastrointestinal calcium absorption.
Magnesium has a number of health benefits, including improved calcium absorption, increased gastrointestinal motility, stool softening, and others. Magnesium deficiency is rare, however, and in the face of adequate calcium intake, supplementation with magnesium is not necessary. Similarly, boron acts as a cofactor in magnesium metabolism. Boron deficiency will exacerbate magnesium deficiency, but boron deficiency is even rarer than magnesium deficit, except in premature infants and alcoholics. Supplements of these minerals offer no benefits for those with normal nutrition.