The first non-topical product designed to treat bothersome and unsightly tear stains that also are a breeding ground for yeast and bacteria. Just add to your dog’s food and watch your dog’s eye health improve. Angels’ Eyes prevents tear staining by tying up circulating porphyrins. A porphyrin is a compound that reacts with light to produce a reddish brown stain to the medial canthus. The ingredients in Angels’ Eyes will prevent your dog from contracting Ptyrosporin (Red Yeast) and bacterial infections which cause excessive tearing and staining. Contains no wheat or dyes, is 100% safe for daily use and guaranteed to clear tearing better than any other product on the market. 30 gram bottle.