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Brewer's yeast is one of the best sources of natural B vitamins including B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin) and B9 (folic acid). These vitamins have a wide range of functions in dogs including aiding digestion, supporting of the nervous system and keeping the skin, hair, eyes, mouth, and liver healthy.
Yeast is also a good source of protein. It is known as a 'complete protein' since it contains all nine of the essential amino acids needed by dogs.