Also indexed as: Saccharomyces cerevisiae
Brewer’s yeast is the dried, pulverized cells of Saccharomyces cerevisiae, a
type of fungus, and is a rich source of B-complex
vitamins, protein (providing all essential
amino acids), and minerals, including a biologically active form of chromium known as glucose tolerance factor (GTF).
Brewer’s yeast is usually a by-product of the brewing industry and should not be
confused with nutritional yeast or torula yeast, which are low in chromium.
Where is it found?
Brewer’s yeast, which has a very bitter taste, is recovered after being used in the
beer-brewing process. Brewer’s yeast can also be grown specifically for harvest as a
nutritional supplement. “De-bittered” yeast is also available, though most yeast
sold in health food stores that does not taste bitter is not real brewer’s yeast.
Brewer’s yeast has
been used in connection with the following conditions (refer to the
individual health concern for complete information):
Who is likely to be deficient?
Brewer’s yeast is not an essential nutrient, but it can be used as a source of B-complex vitamins and protein. It is by far the
best source of chromium, both in terms of
quantity and bio-availability.
How much is usually taken?
Brewer’s yeast is often taken as a powder, or as tablets or capsules. High-quality
brewer’s yeast powder or flakes contain as much as 60 mcg of chromium per tablespoon (15 grams). When doctors
recommend brewer’s yeast, they will often suggest 1–2 tablespoons (15–30
grams) of this high-potency bulk product per day. Remember, if it is not bitter, it is not
likely to be real brewer’s yeast and therefore will not contain biologically active
chromium. In addition, “primary grown” yeast (i.e., that grown specifically for
harvest, as opposed to that recovered in the brewing process) may not contain GTF.
Are there any side effects or interactions?
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.
Because it contains a highly biologically active form of chromium, supplementation with brewer’s yeast
could potentially enhance the effects of drugs for diabetes (e.g., insulin or other blood sugar-lowering agents) and
possibly lead to hypoglycemia. Therefore,
people with diabetes taking these medications should supplement with chromium or
brewer’s yeast only under the supervision of a doctor.
Saccharomyces boulardii is
registered in Europe under the name Saccharomyces cerevisiae, though the manufacturer
states that S. boulardii is not the same as brewer’s yeast (S.
cerevisiae). There is a case report of a person with severely impaired immune function who, after receiving treatment with
S. boulardii, developed an invasive fungal infection identified as S.
cerevisiae.1 People with severe impairment of the immune system should
therefore not take brewer’s yeast or S. boulardii unless supervised by a
Are there any drug
Certain medicines may interact with brewer’s yeast. Refer to drug interactions for a list of those medicines.
1. Bassetti S, Frei R, Zimmerli W. Fungemia with Saccharomyces
cerevisiae after treatment with Saccharomyces boulardii. Am J Med