Debittered brewer’s yeast is an inactive yeast originally recovered as a by-product of beer brewing. The yeast, though no longer alive and having no ability to ferment, is valued as a nutritional supplement and is now grown explicitly for that purpose. Brewer’s yeast has a distinct, slightly bitter flavor and is sold as a fine powder.
Debittered brewer’s yeast is a source of numerous minerals, including iron, zinc, potassium, calcium, and magnesium; and vitamins, particularly B vitamins; as well as protein and fiber. Brewer’s yeast has been proposed as an aid to induce or increase lactation for breastfeeding mothers.