The Most familiar natural source of calcium is limestone. Limestones are used in making fertilizers for the soil and are used in making medicines for calcium deficient people. Calcium carbonate present in limestone is used to reduce acidity in the stomach.

Milk is rich source of calcium with the very high calcium content of around 400 mg of calcium in one cup of milk. Other milk products such as yogurt, cheese and creams are also good source of calcium for body. Milk is a natural source of calcium found in animals.

Other than milk and lime stone, there are several other sources of pure calcium. Green leafy vegetables, beans and nuts are naturally available source of calcium. You can even add sea vegetables to increase the content of calcium in your diet.

Coral calcium which is another form of calcium carbonate is another strong source of calcium. Where can you get this variety of calcium? Coral calcium is obtained from coral reefs which were fossilized hundreds of years ago and is high quality source of calcium. Many medical practitioners recommend that patients suffering from calcium deficiency must consume tablets made from coral calcium after every meal.