Nature’s purest calcium from Maerl a small red seaweed found only in isolated areas off the southwest coast of Ireland. Designed by Dr. Peter D’Adamo without any additional mineral cofactors this formula features a unique source of calcium: Maerl a small red seaweed found only in isolated areas off the southwest coast of Ireland. Maerl has one of the lowest levels of undesirable contaminants. Maerl is composed of a wide variety of essential nutrients including calcium and trace amounts of magnesium boron and zinc. Its superior buffering capacity allows Maerl-based sea calcium to maintain very high rates of absorption and therefore a phenomenal rate of bioavailability.