At 50 mg of biotin per scoop, Biotin Plus™ provides the highest dose of biotin available in a non-prescription formula. The exclusive combination of ingredients makes Biotin Plus™ unequaled in putting a beautiful mane and tail and a deep, lustrous shine on your horse, and with 500 mg of whole raw yucca per dose Biotin Plus ™ helps keep your equine athlete free of minor stiffness. Accept no substitutes! Mix 1 to 2 scoops daily in feed – each scoop is 50 mg. The 20 lb size provides up to a 180 day supply for one horse.