Optimex Anti-Tear 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.