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.
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)
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.
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.
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.
What about the Braggs brand of Nutritional Yeast? Do you recommend that one? Does that have synthetic B vitamins added?
I’m confused, isn’t frontier nutritional yeast sold by radiant health? And isn’t that the company that you’ve promoted?
I’m also confused as to why you grouped brewers yeast and nutritional yeast into one article, after reading this.. I’m suspicious and skeptical of your opinions, recommendations and knowledge in general.
Sarah Pope MGA
Brewers yeast and nutritional yeast are basically the same thing. There is little difference in how the two are processed anymore (there used to be). Radiant Life (not health) sells hundreds of products. While I love the company and promote many of their items, I don’t promote them all by a long shot! Hope that helps.
I use Sari Foods Non-Fortified Nutritional Yeast. I can’t take anything with Folic Acid or synthetic B12 because I have a mutated MTHFR gene. This yeast is soooo good. I use it as a food flavor enhancer to replicate the umami flavor. I even sprinkle a little bit on my cat’s wet food when they’re being finicky.
Nutritional yeast contains inactive yeast, so I believe the fear of causing candida is completely unjustified. If nutritional yeat did contain active yeast, then food prepared that contained it, would become carbonated via yeast activation which it does not. Also, the problem form of candida overgrowth we call yeat infection is from candida albicans, and not brewer yeast or nutritional yeast, which are similar but NOT the same. Unlike brewer yeat, nutritional yeast does not contain chromium.
Sarah Pope MGA
This article did not claim that nutritional yeast causes candida!
KAL brand sells an unfortified version. I have just ordered it and haven’t tried it yet; however, I have tried KAL fortified in the past and it is delicious.
Can I take nutritional yeast .iam 40yrs old.Is it helps to change my white hair to black hair. thank you
Hi Sarah , this whole nutritional yeast thing is off putting can you tell me if the unfortified nutritional yeast that you say you only use would that work in all the cheesy recipes that are on the net for vegans , or is that something totally different hopefully it would work the same as the recipes look amazing but I haven’t purchased any of the nutritional yeast as I’ve always been bit suspicious
Sarah Pope MGA
As I am not a vegan, I would not know if the unfortified yeast would work in vegan cheesy recipes. Sorry about that!
Sarah, I’ve been looking for various recipes online that contain nutritional yeast . I’m afraid of the candida so I try to avoid it . Are they any nutritional yeast that won’t trigger candida ?
Sarah Pope MGA
Nutritional yeast does not trigger candida or cause it to grow like eating sugar does. It may cause an allergic reaction for some people if they have developed a yeast sensitivity from their candida overgrowth. This allergic reaction is not “triggering candida” though.
Hey, thanks for your concise info. on Nutritional Yeast. I do appreciate it, not really wanting to be taking synthetic B’s. Do you have a choice if an adult wants to take a B-Complex supplement? I bought one about a year ago, Country Life, with the methyl-folate & Methyl B-12. Every time I would take it, my stomach seemed to feel funny & eventually, it seemed that my bowels would react. What would be the reason for that? I used to take a B-complex some years ago, for years, but with lack of money, I stopped. I want to get back getting all my B-needs. Looking forward to your response!* Thanks, again!*
So my guy is on Doxepin and still has issues. He sits and pick at his skin constantly until he bleeds. He is also taking red yeast rice.
I’ve asked him a thousand times to see a better doctor,stop taking Doxepin or the red yeast rice. He thinks there is no connection between the 2 and I do. I have giving up, and now almost don’t care if he sits and picks. Whats your idea Sarah?