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Healthy Home Economist / Archives / Healthy Living / 9 Nutritional Yeast Dangers to Avoid

9 Nutritional Yeast Dangers to Avoid

by Sarah Pope / Affiliate Links ✔

Table of Contents[Hide][Show]
  • Gut Problems and Candida
  • Yeast Allergies
  • Blood Sugar Risks
  • Drug Contraindications
  • Yeast products and MSG
  • Genetically Modified Ingredients (GMOs)
  • Gluten Contamination and other Allergies
  • Synthetic Fortification+−
    • Manufacturer Response
  • Inconsistencies Among Yeast Manufacturers

nutritional yeast dangers

There are a number of dangers and hidden pitfalls for consumers to avoid when they choose to use nutritional yeast as food or supplement. While a very helpful and even essential dietary enhancement for some people, especially vegetarians, it is crucial to consider each of these risks carefully before including it as a regular part of your regimen.

Note that brewers yeast is essentially the same thing as nutritional yeast. Though they used to be quite different in years past, the manufacturing process for both is now virtually identical in most cases. Hence, when reviewing the nutritional yeast dangers below, be aware that these same problems exist for brewers yeast.

Gut Problems and Candida

Those struggling with yeast overgrowth issues would do best to avoid food based forms of brewers yeast. This is because the yeast is potentially still active and able to contribute to symptoms. Examples include Vegemite, a popular sandwich spread, and a similar product in the UK called Marmite.

However, dried supplement powders, nutritional flakes, and tablets have no risk of yeast colonization in the gut. The yeast is completely deactivated. Therefore, they pose no problems in the majority of cases.

Yeast Allergies

There are two exceptions to the above discussion. First, for individuals with a yeast sensitivity or allergy, any exposure, live or deactivated, is detrimental.

Second, those with severe intestinal problems such as Crohn’s and ulcerative colitis should be very careful with nutritional yeast and related products even if deactivated.

Blood Sugar Risks

Yeast based foods and supplements are likely high in chromium if made from beer manufacturing residue. While chromium is considered helpful for blood sugar control, studies are actually inconsistent on the matter.

Thus, it is best for someone with diabetes or any other blood sugar issues to consult with a practitioner before using yeast supplements. (1)

Drug Contraindications

Those taking Monoamine oxidase inhibitors (Demerol drugs) need to avoid yeast supplements. They can contain high levels of tyramine. This amino acid has the potential to adversely interact with monoamine oxidase inhibitor type medicines.

Yeast products and MSG

Brewers and other yeast products contain glutamate, a naturally occurring and important amino acid. Fortunately, the concentration of glutamate is far lower than factory-produced glutamic acid, aka MSG (monosodium glutamate).

Glutamate is actually a valuable, naturally occurring amino acid that helps give cheese, meat, mushrooms, and many other foods their rich, desirable umami flavor. The trouble is that some individuals are highly sensitive to any glutamates, natural or otherwise.

Even more people are sensitive to MSG, the highly processed and concentrated form. As a result, some in the healthfood community consider all glutamate bad when it is really just MSG that is the problem for most people.

For many, lack of enough or the complete absence of particular enzymes in the digestive track to break down glutamate causes the sensitivity. Oftentimes, this type of compromised digestion triggers problems with foods containing glutamate, such as traditional bone broth. Thus, the food itself is not really the problem. In those cases, a gut healing diet like GAPS or Autoimmune Paleo can help resolve these issues.

That being said, it is a good idea to source low temperature processed brewers yeast to minimize glutamate formation (vetted brand). If you are particularly sensitive to MSG and glutamate in general, you may wish to avoid this type of supplement entirely. Avoiding foods that contain yeast extract is a good idea too.

Genetically Modified Ingredients (GMOs)

A glucose rich medium is necessary to cultivate yeasts. Hence, the contents of this medium are crucial for a quality final product. Since supplement companies typically use corn, sugar cane, or sugar beet based matrixes, there is a significant likelihood that unless otherwise stated, the manufacturer utilized a genetically modified (GM) medium. This is because the vast majority of farmers growing sugar beets in the US cultivate genetically modified forms. In addition, 92% of corn (81% of corn in Canada) is also of GMO origin as of this writing.

Some manufacturers source organic or certified non-GMO ingredients for making their yeast products. But, if the label does not specifically state it, contact the company about the purity of their products before buying.

Gluten Contamination and other Allergies

Brewers yeast has other risks beyond contamination with GMOs and various agricultural chemicals like glyphosate used on these crops.

If you are gluten free, make sure you get a supplement that guarantees its purity. Manufacturers sometimes use grain based mediums including wheat to grow yeasts. Thus, it is possible that gluten residue contaminates these products.

In addition, some people are allergic to yeasts, including baker’s yeast as well as brewers and nutritional. Some cannot even tolerate the beneficial yeasts in fermented beverages such as kombucha.

This is a separate issue from Candida overgrowth, which these supplements do not encourage. If you or someone in your family has a suspected yeast allergy or sensitivity, these foods will probably not be right for you.

If you are unsure, as with any change in diet or supplements, start small and watch how you feel and how your body reacts. This article on simple at-home allergy testing may prove helpful.

Synthetic Fortification

Buyer beware! Some companies add synthetic nutrients to their yeast, especially vitamin B12. The reason is that yeast only makes this nutrient naturally in very small amounts. So the reputation of yeast supplements as a completely natural source of B vitamins is actually quite untrue.

Yeasts are a good source for SOME B-vitamins only. The high amounts for many nutrients on many product labels are only because the yeasts are fortified with non-yeast created forms.

For example, if the label lists B12, it is safe to assume that it contains added B12. The source is most likely synthetic.

Studies show concerns over synthetic B12. As such, people should beware of buying any yeast supplement that is fortified with synthetic forms of this vitamin. It’s not particularly effective at resolving a B12 deficiency anyway!

In addition to synthetic B12, yeast supplements are frequently fortified with potentially dangerous folic acid. Folic acid is the synthetic form of folate. It triggers serious health problems for those with the MTHFR gene mutation.

Manufacturer Response

To give an example as to why you must ask before ordering, here is a response from Frontier Natural Foods Co-op regarding their nutritional yeast. Incidentally, this is the recommended brand in homemade baby formula because it is low in glutamate. This answer below, however, gives one pause about using it for that purpose.

Thank you for contacting us. Our [Frontier] nutritional yeast is made with [synthetic] folic acid, not folate. Here is from our product detail. After the fermentation process is completed the yeast is harvested, thoroughly washed, pasteurized, and dried on roller drum dryers. The B vitamins are both naturally produced during fermentation, and added to the cream prior to the drying process. Riboflavin (B2) is created during fermentation. Additional Riboflavin (B2) is added after fermentation along with Thiamine (B1), Pyridoxine HCL (B6), Niacin and Folic Acid.

I hope you find this information helpful. If you have additional questions, please let me know.

Inconsistencies Among Yeast Manufacturers

While Frontier uses a very good manufacturing process that produces low levels of MSG, note that the company adds multiple, synthetic or unknown forms of many B-family vitamins to the final product!

In my view, the best nutritional yeast to consume if you have the MTHFR gene mutation or simply wish to avoid synthetic vitamins is to use a completely unfortified quality brand (this brand and this brand are both vetted for quality).

Always be sure to ask about synthetic fortification before buying a nutritional or brewers yeast supplement if you are seeking an entirely natural product.

In summary, it is best to do your homework before buying and consuming nutritional yeast. There are several pitfalls to avoid so that this supplement is part of the solution and does not become part of the problem.

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Category: Healthy Living
Sarah Pope

Sarah Pope MGA has been a Health and Nutrition Educator since 2002. She is a summa cum laude graduate in Economics from Furman University and holds a Master’s degree from the University of Pennsylvania.

She is the author of three books: Amazon #1 bestseller Get Your Fats Straight, Traditional Remedies for Modern Families, and Living Green in an Artificial World.

Her four eBooks Good Diet…Bad Diet, Real Food Fermentation, Ketonomics, and Ancestrally Inspired Dairy-Free Recipes are available for complimentary download via Healthy Home Plus.

Her mission is dedicated to helping families effectively incorporate the principles of ancestral diets within the modern household. She is a sought after lecturer around the world for conferences, summits, and podcasts.

Sarah was awarded Activist of the Year in 2010 at the International Wise Traditions Conference, subsequently serving on the Board of Directors of the nutrition nonprofit the Weston A. Price Foundation for seven years.

Her work has been covered by numerous independent and major media including USA Today, ABC, and NBC among many others.

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Reader Interactions

Comments (34)

  1. Angela Holman

    Jun 20, 2018 at 2:28 pm

    Is the British sandwich spread Marmite a good or bad yeast. My husband is addited to it. Thanks

    Reply
    • Sarah

      Jun 20, 2018 at 6:32 pm

      It is not dried/deactivated and can encourage candida growth if you are susceptible.

  2. Jamie

    Jun 6, 2018 at 9:32 am

    Hello! Very interesting read, but could you clarify the drug contraindications portion? You have Demerol drugs in parentheses after MAOIs, the way I read it is you were classifying that one drug as part of MAOIs? Am I just reading that wrong? In general MAOIs are a class of drugs that are used to treat depression and Demerol is a synthetic opioid pain medication, they are not the same thing. Demerol is also contradicted in people on MAOIs or that have recently used them. Are you saying you should avoid it if you are on any MAOI or are taking Demerol?

    Reply
    • Sarah

      Jun 6, 2018 at 10:23 am

      Here’s what the FDA says. Hope this helps. “DEMEROL is indicated for the relief of moderate to severe pain. DEMEROL is contraindicated in patients with hypersensitivity to meperidine or to any of its ingredients. Meperidine is contraindicated in patients who are receiving monoamine oxidase (MAO) inhibitors or those who have recently received such agents.

  3. Ariane

    May 19, 2018 at 10:34 am

    Sarah, do you prefer brewers yeast, or nutritional yeast? Brewers yeast seems to offer more but people always seem to have the nutritional. And which brand do you buy?

    Reply
    • Sarah

      May 20, 2018 at 1:19 pm

      They are virtually the same anymore … they used to be different, but most processing is exactly the same between the two now. I use an unfortified nutritional yeast.

    • Atila Togay

      Feb 8, 2020 at 8:03 am

      It is not the processing of yeast to produce the final product that differentiates brewers’ yeast from others. The medium on which yeast grows is different (barley wort for beer, ddgs etc for yeast grown for the purpose) and the whole process is profoundly different. Brewers’ yeast, when used for producing alcohol, ferments, in the absence of oxygen. When alcohol is not desired, it undergoes respiration (actual term is oxidative phosphorylation) with lots of oxygen. Result is completely different, although both will produce protein and certain vitamins.

  4. Sophia Beauchemin

    May 19, 2018 at 7:12 am

    Info on nutritional yeast was helpful!

    Reply
  5. Deborah

    May 17, 2018 at 6:15 pm

    Sorbitan monostearate is sometimes referred to as a synthetic wax, this would be Fleischmann’s and Red Star so far that I have found. WAX is not good at all, I am making EINKORN SOUR DOUGH STARTER, just received the package today, WILD YEAST so easy to create and keep like an HEIRLOOM.
    I have confronted PANERA who uses this wax yeast as well as our local employee owned Hyvees about this WAX that is being put in ALL BREADS. This creates MOLD in our bodies when it become blocked which a whole different story. My friend who insists that she does not eat anything “BAD” cannot understand WHY she has colon problems. Well, WAX will do it.
    Pretty disgusting if you ask me.

    Reply
    • Sarah

      May 18, 2018 at 9:13 am

      So many reasons to avoid all commercial bread! I can’t remember the last time I ate some 🙂

  6. renee

    May 17, 2018 at 3:31 pm

    I all, I have been using Azure Standard nutritional yeast – GMO free. Tell me what you think – is it a good one?

    Reply
    • Sarah

      May 17, 2018 at 3:32 pm

      You will have to call the company and ask about the processing and whether any of the B vitamins are synthetic.

  7. Mary B

    May 17, 2018 at 3:11 pm

    You know, I hadn’t understood the difference between nutritional yeast and brewer’s yeast until recently, when a Seattle Coop (PCC) ran a letter to the editor in their newsletter about them. Nutritional yeast is by definition fortified with B12 and other vitamins and the usual form of B12 in fortified foods is cobalamin, the usual form of supplemental folate is folic acid. I don’t believe that the company that says they add “folate” can be accurate (folate in what form?), unless somehow they fortify their nutritional yeast with methylfolate instead of folic acid. Here’s the PCC letter – pccmarkets.com/sound-consumer/2018-02/letters-to-the-editor/

    Reply
    • Sarah

      May 17, 2018 at 3:35 pm

      I’m not sure I believe Twin Labs either! Glad you brought that up. Their answer was that the “folic acid” on the label is actually folate, but that seems fishy to me. I am sticking to the unfortified nutritional yeast. I don’t want anything fortified because by definition, that almost always mean synthetic vitamins.

  8. Lindsay

    May 16, 2018 at 4:17 pm

    why is Frontier a “vetted brand” that you linked to on Amazon when it contains synthetic Bs? I also use Lewis Labs

    Reply
    • Sarah

      May 16, 2018 at 4:57 pm

      It’s vetted to be low temperature processed and so contains minimal amounts of glutamate. However, this brand contains synthetic folic acid, so best to steer clear.

  9. Ellen

    May 16, 2018 at 6:59 am

    I thought you would recommend some good ones to buy. I bought Lewis Labs Brewers yeast for some years but it it very expensive now.

    Reply
    • Sarah

      May 16, 2018 at 8:32 am

      You’re right! Here’s the one I use. I’ve linked to it in numerous other articles, but forgot to do it here! http://amzn.to/2hFJunc

  10. Barbara

    May 15, 2018 at 10:51 pm

    I’ve currently use Frontier’s nutri yeast, but will be stopping. Thank you, Sarah! I found this link to a promising nutri yeast on amazon: Pure Natural Non-fortified Nutritional Yeast Flakes (8 oz.) Whole Food Based Protein Powder, Vitamin B Complex, Beta-glucans and all 18 Amino Acids amazon.com/dp/B00PJ3IPMI/ref=cm_sw_r_cp_api_i_LQ5-AbCFAVMC8

    Reply
    • Sarah

      May 16, 2018 at 8:35 am

      Yes, that’s the same one I use.

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