Introduction
Brewer’s yeast is a by-product made when brewing beer. It has been used to aid digestion. It can be taken as a pill or powder.
Dosages
500 milligrams 1 to 2 times daily.
What Research Shows
Likely Effective
- Irritable bowel syndrome —likely to ease pain and discomfortC1, C2
May Be Effective
- Allergic rhinitis—may reduce nasal congestionA1
- Cold/flu-like symptoms —may reduce the incidence of these symptomsB1, B2
Not Enough Data to Assess
- Premenstrual syndrome D1
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
Safety Notes
It is likely safe for most adults to take brewer’s yeast for a short time. People sensitive or allergic to yeast may have reactions to brewer’s yeast. Not enough studies have been done to say whether it is safe to take for a long period. It is also not known whether it is safe to take by women who are pregnant or breastfeeding.
Interactions
Talk to your doctor about any alternative therapy or supplements you are taking to make sure they do not interfere with your current treatment.
- People with Crohn’s disease or weakened immune systems from other diseases or treatments should talk to their doctors before taking brewer’s yeast.E1, E2
References
REFA Allergic Rhinitis
REFA1 Moyad MA, Robinson LE, et al. Immunogenic yeast-based fermentation product reduces allergic rhinitis-induced nasal congestion: a randomized, double-blind, placebo-controlled trial. Adv Ther. 2009 Aug;26(8):795-804.
REFB Cold/Flu-Like Symptoms
REFB1 Moyad MA, Robinson LE, et al. Effects of a modified yeast supplement on cold/flu symptoms. Urol Nurs. 2008 Feb;28(1):50-55.
REFB2 Moyad MA, Robinson LE, et al. Immunogenic yeast-based fermentate for cold/flu-like symptoms in nonvaccinated individuals. J Altern Complement Med. 2010 Feb;16(2):213-218.
REFC Irritable Bowel Syndrome
REFC1 Pineton de Chambrun G, Neut C, et al. A randomized clinical trial of Saccharomyces cerevisiae versus placebo in the irritable bowel syndrome. Dig Liver Dis. 2015;47(2):119-124.
REFC2 Cayzeele-Decherf A, Pélerin F, et al. Saccharomyces cerevisiae CNCM I-3856 in irritable bowel syndrome: An individual subject meta-analysis. World J Gastroenterol. 2017;23(2):336-344.
REFD Premenstrual Syndrome
REFD1 Facchinetti F, Nappi RE, et al. Effects of a yeast-based dietary supplementation on premenstrual syndrome. A double-blind placebo-controlled study. Gynecol Obstet Invest. 1997;43(2):120-124.
REFE Safety
REFE1 Alic M. Baker's yeast in Crohn's disease--can it kill you? Am J Gastroenterol. 1999 Jun;94(6):1711.
REFE2 Muñoz P, Bouza E, et al. Saccharomyces cerevisiae fungemia: an emerging infectious disease. Clin Infect Dis. 2005 Jun 1;40(11):1625-1634.