About this item Harvested in the cool, clean and pristine waters off the coast of Iceland, Aquamin's Red Algae and Seawater Marine Calcium, Magnesium, and Multi-Mineral Complex supplies bio-active magnesium, calcium and 72 other trace minerals. 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 magnesium's bioactivity. Plant based minerals differ elementally and structurally from mined minerals. Nature's Answer Calcium Magnesium supports Healthy Bones, Boosts the Immune System and is beneficial for the Heart and Muscles. Marine vegetation is richer in minerals than vegetation from the land. Plant based sea minerals' unique porous honeycombed vegetative cell structure gives it a number of significant benefits from it's chemical behavior to its absorption.