Since the chromium-niacin combination found in chromium-enriched brewer's yeast may affect blood glucose and insulin levels, people with diabetes or hypoglycemia should consult their doctors before supplementing their diets with these forms of brewer's yeast.
Some people may be allergic to brewer's yeast. In a study using an elimination diet to treat 60 migraine patients, brewer's yeast was found to be one of the foods likely to contribute to the initiation of a migraine.
Brewer's yeast is not related to Candida albicans, the typical culprit in vaginal yeast infections in women. The nutritional and chemical profile of brewer's yeast depends on the medium on which it was grown. Therefore, purchase organic brewer's yeast when possible.