A unique wholefood source of natural calcium, GreenCALCIUM is an organic marine plant (Lithothamnium calcareum) naturally rich in elemental calcium, magnesium and 72 other trace minerals crucial for optimum calcium absorption and bone health. GreenCALCIUM contains 34% elemental calcium and has a unique porous ‘honeycomb-like’ structure and the large surface area that allows for greater absorption and utilisation of calcium in the body.