Nature's Answer Marine Based Cal-Mag is a unique multi-mineral complex in liquid form. Derived from Aquamin's red algae and seawater in pristine Icelandic waters. Harvested in the cool, clean and pristine waters off the coast of Iceland, Aquamin's red algae and seawater marine, providing calcium and magnesium, make up this multi-mineral complex. Supplies bio-active calcium, magnesium and 72 other trace minerals! In an area untouched by industry, the warm waters of the gulfstream meet the cold clean waters of the arctic and the perfect conditions exist for red algae to build up. Supported by a significant and growing body of scientific publications, Aquamin's unique matrix of trace minerals works synergistically together to give a powerful boost to calcium and magnesium's bioactivity. Plants vs Rocks Marine based minerals differ elementally and structurally from mined minerals. Marine vegetation is richer in minerals than vegetation from the land. Marine based sea minerals' unique porous honeycombed vegetative cell structure gives it a number of significant benefits from its chemical behaviour to its absorption. A unique trace mineral profile is gained from its marine source. The elements are at trace quantities within a multimineral matrix working synergistically to deliver a powerful boost to the action of calcium and magnesium. About Nature's Answer Natures Answer were founded in 1972, and to this day remain a family-owned and operated business. With the highest standards for their natural products and liquid herbal extracts, Natures Answer is dedicated to purity and top-notch manufacturing. Natures Answer want to be as comprehensive as possible in the testing they do and the standards they follow. Thats why they measure their product safety against both European and US standards. Nature's Answer Marine Based Cal-Mag is a unique multi-mineral complex in liquid form. Derived from Aquamin's red algae and seawater in pristine Icelandic waters.