There a variety of sources of what is often called "nutritional yeast". One of these - and usually the best choice - is certified brewer's yeast, a complete food, left over from the process of creating alcohol. Brewer's yeast is generally regarded as a "health food" because it is easily digested and has a high nutrient content. Brewer's yeast consists of the dried, pulverized cells of Saccharomyces cerevisiae, a type of fungus. It is a rich source of the B-complex vitamins, all essential amino acids, and minerals, particularly chromium. It is considered a superior form of chromium, both in terms of quantity and bio-availability. High-quality brewer’s yeast powder or flakes contain as much as 60mcg of chromium per Tablespoon (15gm). Brewer's yeast should not be confused with other forms of yeast like baker's yeast, other nutritional yeasts, or torula yeast, which are low in chromium. When in doubt, enquire about the chromium content.

When using brewer's yeast, start with 1 to 2 teaspoons daily because it may cause gas in some individuals. As you tolerate it, gradually increase your dose to 1 to 2 tablespoons, watching how you feel as you do. If symptoms improve, you have a new power-packed food that may provide considerable health benefits. If symptoms worsen, you may have a chronic Candida infection in which case this supplement is not right for you.

Side-effects have not been reported from the use of brewer's yeast, although allergies to it exist in some people. It is not related to Candida albicans fungus, which causes yeast infection. Certain medications may interact with brewer's yeast and it is recommended that you discuss the use of brewer's yeast and your current medication(s) with your doctor or pharmacist.

Reference: Bassetti S, Frei R, Zimmerli W. Fungemia with Saccharomyces cerevisiae after treatment with Saccharomyces boulardii. Am J Med 1998;105: pp.71-2.