Pet-A-Zyme I-Stain safely and effectively combats unwanted eye stains in pets caused by bacteria and excessive tearing. High in enzymes, colostrum, probiotics, amino acids and bioflavonoids. Contains no antibiotics, drugs, chemicals or other long-term toxic products. Pet-A-Zyme I-Stain is an all-natural oral supplement that is easy to feed. Simply mix the appropriate dose in with your pet's food. Water-soluble. Made in USA.