Natural Factors Kid’s Magnesium features 50 mg of bioavailable magnesium citrate in a delicious bubble gum-flavored chewable tablet. The citrate form of magnesium is extremely well absorbed and well tolerated by the body, and magnesium is necessary for hundreds of enzyme reactions in the body and for normal heart function.* It is necessary for protein synthesis, carbohydrate metabolism, proper muscle function, and helps absorb calcium and potassium.*