Active ingredients per g: 100 mg Calcium Carbonate, 78mg Potassium Citrate, 80mg Chitosan, 100mg Inulin, 2.5mg Folic Acid, 2.5mg Ascorbic Acid, 2.5mg Pyridoxine HCI, 750,000,000 cfu Lactobacillus acidophilus, 750,000,000 cfu Bifidobacterium bifidum.

Wellmark Kidney Supplement uses calcium carbonate and chitosan as binders. The phosphorus binders basically bind with some of the phosphorus in the food in the intestitine to prevent absorption and lower phosphorus levels in the pet. It also contains probiotics which are supposed to help regulate kidney disease.