We think this is the best Calcium on the market. A natural calcium – rich marine plant also containing magnesium and trace minerals for improved bone health and bio-availability. A unique wholefood source of calcium, Green Calcium is an organic marine plant (Lithothamnium calcareum) that is naturally rich in calcium, magnesium and 72 other trace minerals important for maximum calcium absorption and bone health. Environmentally harvested from the clean,mineral rich Atlantic waters off the west coast of Ireland and the north west coast of Iceland inder ISO 9001-2000 and HACCP certification, Green Calcium contains 34% pure calcium and has a unique porous structure with a large surface area for greater absorption and utilisation of the calcium in the body. Green Calcium contains NO animal products, is gluten free, dairy free, GMO free, allergen free, highly alkaline and suitable for vegetarians and vegans.