There's a reason that dairy calcium milk and yogurt - is preferable to calcium supplements for helping to maintain strong bones: sugar.

According to the Reebok Aerobic Information Bureau, research by USDA-Tufts University found that a teaspoon of glucose taken with calcium increased the body's absorption of calcium by 25 percent. Yogurt and milk have built-in sugar, which helps you absorb the bone-building calcium better.