Lifestream natural calcium is produced from an organic sea vegetable called lithothamnium calcareum and demonstrates advanced bioavailability of calcium and other important co factor minerals including boron magnesium zinc copper iodine and sulphur calcium is one of the most essential and important minerals in our body it is used by almost every cell in the body including bones teeth the heart and nerves calcium is necessary for muscle contraction and for the development and maintenanc