Bio-Coat for dogs and cats is highly concentrated. Contains 6 mg of Biotin (an essential B vitamin) per tsp. Safe and effective alternative to prednisone and antihistamines for all breeds of dogs and cats. Formulated in a base of human-grade nutritional yeast (not brewers yeast). Feed 1/4 tsp per day for each 30 lb of body wt. 6 oz size lasts 6 months for small dogs and all cats. 16 oz size lasts 6 months for larger dogs. Choose from 3 oz,6 oz or 16 oz sizes.