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Brewer's Yeast

Medically reviewed by Last updated on February 22, 2021.

What are other common names?

  • S. cerevisiae
  • Saccharomyces cerevisiae
  • Baker's Yeast
  • Betafectin
  • Dried Yeast Fermentate
  • EpiCor
  • Fibercel
  • Medicinal Yeast
  • Yeast

What is this product used for?

Brewer's yeast is used by some people as a food supplement to give some B vitamins. Others use it to help with sudden loose stools or diarrhea.

What are the precautions when taking this product?

  • Always check with your doctor before you use a natural product. Some products may not mix well with drugs or other natural products.

  • Do not use this product if you have allergies to yeast.

  • This product contains the amino acid tyramine. Do not use this product if you are taking drugs called MAO inhibitors. These are drugs like isocarboxazid (Marplan), phenelzine (Nardil), and tranylcypromine (Parnate).

  • Take extra care and check with your doctor if you have:

    • An infection

    • Stomach problems, especially Crohn’s disease

What should I watch for?

  • Upset stomach

  • Stomach cramps

  • Increased gas

When do I need to call the doctor?

  • Signs of a very bad reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat. Go to the ER right away.

  • Very bad belly pain

  • Very bad loose stools

  • Very bad headache

Last Reviewed Date


Consumer information use

This information is not specific medical advice and does not replace information you receive from your healthcare provider. Only your healthcare provider has the knowledge and training to provide advice that is right for you. You should not rely on this information in deciding whether or not to use, or accept your healthcare provider’s advice regarding use of, any natural products or similar treatments, therapies, or life-style choices. This information does not endorse any natural products or similar treatments, therapies, or life-style choices as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information. It does NOT include all information about natural products, possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to you. You must talk with your healthcare provider for complete information about your health and treatment options.


Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.