NOW Calcium & Magnesium increases the absorption of calcium to improve strong bones and teeth. NOW Calcium & Magnesium boosts the absorption of magnesium, which encourages health enzymatic activity. Calcium and Magnesium work together to promote absorption. NOW Calcium & Magnesium does not contain any sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, eggs, shellfish or preservatives.