Wholistic Pet Organics Sea Coral Calcium sourced from Caribbean Seas is a synergistic form of calcium providing bone, immune, and muscle support. Free from iodine and lead, it is easy to digest and well absorbed by dogs, cats and horses. Because of its all natural composition, Wholistic Sea Coral Calcium ™ is able to deliver the most highly available and utilizable form of calcium—38% calcium, 72 trace minerals, and a 2:1 calcium/magnesium ratio. Use it to strengthen the immune system, support healthy bones and muscles, nourish geriatric dogs, help Cushings patients, and to regulate body pH. Product of USA.