Optimex AntiTear Stain is designed to eliminate under eye tear stains, and staining around the mouth and feet. It reduces the staining by activating your pet"s natural immunity against stain causing bacteria.Use a tiny scoop of Optimex on your dog or cat"s food daily, and watch the tear stains vanish naturally in two weeks. The Optimex formula is made with the highest grade ingredients including Argentine grass fed beef. Veterinarian recommended for a healthy immune system.