Brewer's yeast is made from a one-celled fungus called Saccharomyces cerevisiae and is used to make beer. It also can be grown to make nutritional supplements. Brewer's yeast is a rich source of minerals -- particularly chromium, an essential trace mineral that helps the body maintain normal blood sugar levels; selenium; protein; and the B-complex vitamins. It tastes bitter and should not be confused with baker's yeast, nutritional yeast, or torula yeast. All those types of yeast are low in chromium. Brewer's yeast has been used for years as a nutritional supplement.
Brewer's yeast is often used as a source of B-complex vitamins, chromium, and selenium. The B-complex vitamins in brewer's yeast include B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B9 (folic acid), and H or B7 (biotin). These vitamins help break down carbohydrates, fats, and proteins, which provide the body with energy. They also support the nervous system, help maintain the muscles used for digestion, and keep skin, hair, eyes, mouth, and liver healthy.
Brewer's yeast does not contain vitamin B12, an essential vitamin found in meat and dairy products. Vegetarians sometimes take brewer's yeast mistakenly believing that it provides B12, which can be lacking in their diet.
Some studies suggest that chromium supplements may help people with diabetes control blood sugar levels. People with diabetes either do not produce enough insulin -- a hormone needed to change sugar, starches and other food into energy -- or cannot use the insulin that their bodies make. Chromium may lower blood sugar levels as well, improving glucose tolerance and reducing the amount of insulin needed. Because brewer's yeast is a rich source of chromium, scientists think it may help treat high blood sugar.
A few studies suggest that brewer's yeast may help lower LDL ("bad") cholesterol levels in the blood and raise HDL ("good") cholesterol levels. Researchers aren't sure whether that is due to the chromium in brewer's yeast or another substance, and not all studies have found positive results.
Although some studies suggest that chromium may help reduce body fat, the amount of fat lost is small compared to what can be lost with exercise and a well-balanced diet. However, brewer's yeast is also used as a protein supplement and energy booster, so it may help maintain a healthy weight.
At least one study has found that brewer's yeast may improve acne. Another linked it to a reduced risk of a second skin cancer. And one large, preliminary study found that taking a specific kind brewer’s yeast product (EpiCor) may help prevent colds and flu.
Brewer's yeast is available in powder, flakes, tablet, and liquid forms.
How to Take It
Brewer's yeast is not recommended for use in children, because it hasn’t been studied.
1 - 2 Tbsp per day; may be added to food or dissolved in juice or water.
Because supplements may have side effects or interact with medications, you should take them only under the supervision of your health care provider.
Side effects from brewer's yeast are generally mild and may include gas.
People who have frequent yeast infections or are allergic to yeast should avoid brewer's yeast.
People with diabetes should talk to their health care provider before taking brewer's yeast because it could interact with medications for diabetes and cause low blood sugar. (See "Possible Interactions" sections.)
People with Crohn’s disease should ask their health care provider before taking brewer’s yeast.
If you are being treated with any of the following medications, you should not use brewer's yeast without first talking to your health care provider.
Monoamine Oxidase Inhibitors (MAOIs) -- Brewer's yeast contains a large amount of tyramine, a substance that can interact with MAOIs and cause a hypertensive crisis. A hypertensive crisis is a very fast and dangerous rise in blood pressure that can cause heart attack or stroke. MAOIs are used to treat depression and include:
- Phenelzine (Nardil)
- Tranylcypromine (Parnate)
- Selegiline (Ensam, Eldepryl)
- Isocarboxazid (Marplan)
Meperidine (Demerol) -- As with MAOI antidepressants, brewer's yeast may also lead to a high blood pressure crisis if it is taken with Demerol, a narcotic medication used to relieve pain.
Medications for Diabetes -- Brewer’s yeast may lower blood sugar levels. When combined with diabetes medications, taking brewer's yeast could raise the risk of having low blood sugar. If you take medications for diabetes, ask your health care provider before taking brewer’s yeast.
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Steven D. Ehrlich, NMD, Solutions Acupuncture, a private practice specializing in complementary and alternative medicine, Phoenix, AZ. Review provided by VeriMed Healthcare Network.
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