Brewer's yeast can provide energy and may help maintain healthy skin, hair, eyes, and mouth. It may be effective at supporting the nervous system and enhancing the immune system. The chromium in brewer's yeast may help control sugar levels for patients with type 2 diabetes by improving glucose tolerance. It is typically used in alternative medicine to promote digestive health and is believed to treat a number of health conditions, including colds, flu, diarrhea, and diabetes.