NaturesPlus Cal/Mag with Whole Foods distinguishes itself by utilizing 'Brown Rice Calcium Aminoate Complex' and 'Brown Rice Magnesium Aminoate Complex.' These are forms of chelated minerals, which are generally recognized for their high bioavailability, meaning the body absorbs and utilizes them very efficiently. They are also typically gentler on the digestive system compared to less bioavailable forms. The 'Whole Foods' aspect implies that the minerals are delivered within a natural food matrix, potentially offering synergistic phytonutrients that can further enhance absorption and biological activity. While the elemental doses (500mg Calcium, 250mg Magnesium) are moderate, the superior absorption of these forms often means they are more effective than larger doses of less absorbable forms. The price per serving is very competitive for a product offering such premium, food-derived chelated forms, presenting excellent value.