After five or ten brews, yeast used in brewing beer loses its vigour. It is then sterilized, dried and sold for food flavouring or as nutritional supplements. It has no fermenting or leavening power left.
Brewer’s yeast can taste bitter, owing to the taste of the hops in the beer. You can buy “debittered” brewer’s yeast, which has this bitter taste removed.
It can be bought powdered, in flakes or in pills.
Thiamine; Riboflavin; Niacin; Pyridoxine; Pantothenic Acid; Biotin; Choline; Inositol; Folic Acid; Paraminobenzoic Acid.
Also contains chromium, which reputedly works to lower insulin levels and in fighting diabetes.
Some people report bowel irritability.