IrRAWsistible is pleased to offer Eggshell Calcium as our first supplement. Eggshell Calcium is a premium, 100% all natural source of calcium. Made from ground eggshells, it is one of nature's purest and most bioavailable forms of calcium. This highly concentrated source of calcium also provides other trace minerals necessary for bone health including strontium, magnesium, zinc and copper. Eggshell Calcium is the supplement solution for pet owners feeding a homemade raw or cooked diet, or for pets requiring additional calcium in their diet.