Brewer's Yeast 650 mg Tablets - Nutritional Supplement Brewer's Yeast has several naturally occurring vitamins, minerals and other beneficial nutrients. Brewers yeast offers other components such as amino acids and beta-glucans. No synthetic vitamins are added to the yeast during processing. Brewer's Yeast has naturally occurring B-vitamins such as: Thiamin (Vitamin B-1), Riboflavin (Vitamin B-2), Niacin, Vitamin B-6, Folic Acid, Vitamin B-12, Biotin and Pantothenic Acid. Natural color variations may occur in this product. Store in a cool, dry place after opening.