Extra Strength Biotin 100 was formulated by Dr. Ric Redden in 1990 for his personal podiatry cases. Biotin has long been noted as a supplement that aids natural keratinization process. Hair and horn (hoof capsule) are constantly undergoing growth, maturation and keratinization. Biotin 100 has become the horseman's choice. Feeding 1 oz per day delivers 100 mg of Biotin and 50 mg of DL-Methionine. This feeding is recommended for a 1000 lb+ mature horse. To maintain the ultimate quality and freshness we hand scoop each gallon in-house.