Tricalcium Citrate with 21% Calcium, is a highly absorbable chelated source of Calcium.Pro Airway Plus has a powerful blend of natural antioxidants, herbs, and vitamins for support of a healthy respiratory and immune system.Beta Glucan is a powerful Equine Immune System support, G.I. Tract Health & Performance Support.Vitamin A D E & K is a source of fat soluble Vitamins for horses.