GNC Earth Genius Vegetarian Calcium features Aquamin derived from sea algae, sustainably harvested in the pristine, cool waters off the Icelandic coast. Aquamin sea algae is a rich source of calcium, magnesium, and 72 trace minerals. This supplement is essential for teeth and bone building and is involved in muscular and nerve function. Adequate calcium as part of a healthy diet throughout life may reduce the risk of osteoporosis. To enhance calcium absorption, this product includes vitamin D-3 from lichen, which also helps support healthy teeth and bones. It contains no artificial colors, flavors, or preservatives and is gluten-free and non-GMO.