Among vegans, it’s practically considered an essential food.

Among average Americans, it’s a foreign food. They don’t know what it’s made out of or how it’s used.

Well here’s everything you need to know about it. The ways nutritional yeast is good for you, based on actual science and clinical studies, as well as the potential dangers or side effects.

What is nutritional yeast made out of?

Yeast is a single-celled fungus which feeds on sugar (carbohydrates). Nutritional yeast refers to varieties specifically grown for human consumption. Usually it’s made from a strain of Saccharomyces cerevisiae.

Unlike baker’s yeast and brewer’s yeast which are both living, nutritional yeast has been deactivated (killed). Its main health benefit is being a rich source of B vitamins and minerals, and hence, its name.

Since nutritional yeast is not living, it can’t cause or worsen yeast infections such as Candida albicans overgrowth. Even though some sources allege that danger, there isn’t science to support it. At least if one is talking about standard nutritional yeast, which only consists of dead fungi.

What’s nooch? It’s another name for nutritional yeast. The most common nickname. It’s particularly popular among vegans and those who eat it regularly.

Nutrition facts

A one tablespoon serving of nutritional yeast is 20 calories, with 0g of fat, 1g of carbs, 1g of fiber, and 2g of protein. It provides over 100% of the daily value for the vitamins thiamine (B1), riboflavin (B2), and pyridoxine (B6). Roughly half the daily value for niacin (B3), pantothenic acid (B5), folic acid (B9), and cobalamin (B12). The minerals zinc, selenium, and iron are 10% or less of RDA.

nutritional yeast nutrition facts

Bragg is the bestselling brand and their nutrition facts are fairly typical for nutritional yeast flakes. KAL and Red Star, which are almost as popular, have a higher concentrations for most of the B vitamins, however that’s due to extra fortification. All of these brands are dairy free, egg free, sugar free, and gluten free. Bragg and Red Star are kosher.

While it’s commonly cited as a good vegan source, the amount of vitamin B12 in nutritional yeast is naturally zero. Bragg, Red Star, Bob’s Red Mill, KAL, Trader Joe’s, and most other brands only contain B12 because they add it. The typical amount added leads to each tablespoon providing 50-150% of the daily value.

Taste and texture

What is nutritional yeast good for?

The B vitamins are its biggest nutritional benefit, while the cheese-like flavor are its most prized quality for cooking and recipes.

one tablespoon serving of nutritional yeast flakes

Nutritional yeast tastes nutty and cheesy. When you add moisture to the dry flakes, they even have a creamy texture like cheese. It’s a strong flavor that’s somewhat pungent, which is why not everyone likes it as a stand-alone.

Some people say it doesn’t taste exactly like cheese, which is true. If you want to replicate dairy as close as possible, the trick is to use nooch in combination with other plant-based ingredients, like pureed soaked cashews or almonds. This seasoning with a little sweet potato in mac ‘n cheese works wonders.

Health benefits of nutritional yeast

1. Vegan source of vitamin B12

Even though it’s from fortification, it’s still noteworthy because there aren’t many vegan B12 food sources.

2. Cholesterol-free cheese substitute

Is Daiya plant-based cheese healthy? It’s cholesterol free unlike real cheese and it is healthier on a relative basis, but it’s not healthy. Daiya is almost all fat and not the healthy types.

Nut and nutritional yeast based vegan cheeses are better for you; higher protein content and healthier fats.

Gopal's Rawmesan

Our favorite is Gopal’s Rawmesan. Keep in mind that 1g of protein per 15 calories equals around 7g per 100 calorie serving. That actually beats real cheese made from cow milk.

Gopal’s is high protein and very low sodium, the latter of which is an advantage that real cheese and Daiya don’t offer. You can buy Gopal’s on Amazon.

3. Protein represents 40% of calories

Protein is 4 calories per gram. There are 2g per serving, which means 8 of the 20 calories in Bragg nooch flakes are in the form of protein.

2g of protein may not seem like much, but remember that’s for just one tablespoon. If you’re on a plant-based or dairy-free diet, you may be using several tablespoons (or more) to flavor mac ‘n cheese, popcorn, pizza, tacos, and pasta.

gluten free cauliflower crust pizza topped with artichokes, bell peppers, and nut cheese

Think about it… if you add 5 tablespoons, that’s 10g of protein and is just 100 calories. We used it to top this gluten free cauliflower crust pizza.

4. Low sodium flavor enhancer

Nutritional yeast has no added salt and its natural sodium content is 10 mg per tablespoon. That’s below 1% of the daily value.

Because its pungent cheese-like taste is so strong, it’s a major flavor booster for almost anything you sprinkle it on… while adding almost no sodium in the process.

There are a few hot sauce brands without salt added. Except for those, practically all condiments are sodium bombs. Ketchup, mustard, soy sauce, you name it… they all have high amounts of salt.

Instead of salt, try sprinkling some nutritional yeast on popcorn.

5. Good source of fiber

The 1g of fiber per tablespoon seems trivial, but if you’re eating 4 or 5 of them, that equates to being 20-25% of the recommended daily value.

What’s real special though is the type of fiber it contains.

Nutritional yeast is rich in beta-1,3 glucan, better known as beta glucans. Many of its health benefits are believed to be related to this unique fiber. (1)

6. Seasonal allergy relief

If you live in the Midwest and suffer from seasonal allergies, pay attention.

The University of Michigan conducted a 12-week randomized, double-blinded, and placebo-controlled clinical trial using nutritional yeast.

96 people with seasonal allergies, who were otherwise healthy, were given a supplement or a placebo to take for 12 weeks during peak pollen season.

table showing EpiCor vs. placebo for seasonal allergies and hay fever

Those taking nooch had fewer and less severe allergy symptoms, apparently due to immune modulating effects from it.

In addition to suffering fewer days, the severity of nasal congestion, runny nose, sneezing, watery eyes, and other symptoms were lower vs. placebo.

The 500 mg supplement used the same species commonly found in food nutritional yeast (Saccharomyces cerevisiae). However it went through a natural fermentation and drying process which is proprietary, so it’s not identical to a bottle of Bragg’s. (2)

Embria Health Sciences sells this version, branded as EpiCor, and you can get it on Amazon.

7. Cold and flu symptom relief

Not one, but two double-blinded and placebo-controlled studies have been published to date which suggest that nutritional yeast may help with cold and flu side effects.

In the first 12-week trial of 116 people, it was reported (3):

“EpiCor, a modified yeast based (Saccharomyces cerevisiae) dietary supplement taken daily, appears to significantly reduce the incidence and duration of cold and flu-like symptoms when compared to placebo in subjects vaccinated for seasonal influenza”

In that study, everyone had received the flu vaccine. Similar positive results were seen in a concurrent trial of the same size involving non-vaccinated participants.

Why is this happening?

It might be because nutritional yeast has been found to stimulate B lymphocytes and natural killer (NK) cells in the body. Two things that reduce inflammation and support immune system performance. (4)

8. Healing and improving acne

It may not be the exact same thing as EpiCor but the German brand Perenterol sounds quite similar. It’s 250 mg capsules of a dried Saccharomyces cerevisiae dosage.

It was used in a randomized, placebo-controlled, and double-blinded clinical trial involving 139 patients with acne. They took it for 5 months.

74.3% of the patients taking the nutritional yeast supplement experienced “good” or “very good” results, as assessed by a dermatologist. Only 21.7% of the placebo group ranked that high. (5)

9. Better immune response during exercise

Interleukins are a type of cytokine (signaling molecule) which are used by the immune system. They signal white blood cells.

In short, interleukins tell the immune system to act!

During strenuous exercise, like intense bodybuilding and long-distance running, it’s been well documented that immune system performance drops. This is most likely due to the fact that the body has to struggle with the stress of the fitness. Only so much resource can be allocated to maintaining basic immune function.

As published in the prestigious British Journal of Nutrition, researchers at the The University of Houston tested a branded source of yeast (Wellmune WGP) on athletes.

They called it baker’s yeast but it’s same species found in nutritional yeast (S. cerevisiae). Both are actually the same thing, the only difference is that one is dead (nutritional) and one is living (baker’s).

In this case, they probably should have called it nutritional rather than bakers, because it was dead.

60 athletic men and women completed two trials using this yeast or a placebo (rice flour). There was a 7-day washout period between each trial. The supplement or placebo was taken during the 10 days leading up to each fitness test.

That test was a one hour cycling course in extreme heat (38°C or 100°F) and high humidity.

The results?

graph showing Wellmune Beta 1,3/1,6 glucan increasing monocytes in humans

When they were supplementing for 10 days prior with the yeast, they had higher monocyte concentrations.

graph showing Wellmune Beta 1,3/1,6 glucan increasing interleukin 4 in humans

They also had higher interleukin counts of IL-2, IL-4, IL-5 and interferon-y (IFN-y) at pre and post-workout.

In short, yeast appears to improve immune system response during high-intensity physical activity, such as exercise. (6)

10. Antioxidant support

The amount of antioxidants in nutritional yeast is limited. While rich in B vitamins, those aren’t known for having antioxidant activity. Vitamins C and E are do but nooch doesn’t contain any.

What it does have is selenomethionine, which is a naturally occurring amino acid containing selenium.

In some scenarios, selenomethionine acts as an antioxidant.

More importantly, this source of selenium, along with the trace mineral zinc, influence immune system function. (7) (8)

That fact, along with the other unknown active ingredients in nutrition yeast which appear to support immunity, may boost the body’s internal production of antioxidants, such as superoxide dismutase.

As part of a 15 km (9.3 mi) race in Germany, scientists studied 9 athletes who took a twice-daily yeast supplement for 6 weeks. Less free radical stress was observed. (9)

Nutritional yeast side effects

  • Allergy risk
  • Lead exposure
  • Gas and bloating
  • May worsen Crohn’s disease
  • May be bad for autoimmune diseases

You can be allergic to nutritional yeast but very few published case studies exist in medical literature. Hives and asthma have been reported in a boy whenever he ate pizza or bread containing yeast. Even though that’s baker’s yeast, it’s the same species as nutritional yeast (Saccharomyces cerevisiae). Plus since those foods are baked, the yeast is killed, essentially making it equivalent to nutritional. (10)

In Crohn’s disease patients with elevated yeast antibody counts, all forms of yeast – whether bakers, brewer’s, or nutritional – may adversely affect symptoms. (11)

On the flip side, a small pilot study of 20 Crohn’s patients suffering from diarrhea experienced “a significant reduction in the frequency of bowel movements in the tenth week” versus placebo when taking nutritional yeast. So it may be harmful or helpful, depending on circumstances. (12)

While normally considered a health benefit, the ramping up of the immune system – as reported by multiple studies – suggests that nutritional yeast may be bad for you if you suffer from an autoimmune disease. Rheumatoid arthritis, lupus, and multiple sclerosis (MS) are examples where higher immune system activity may have an adverse effect on health.

Side effects of gas or upset stomach may result from eating too much nutritional yeast. This isn’t a sign of a serious danger, as it’s likely caused from the dietary fiber; beta-1,3 glucan, which also acts as a prebiotic. Although healthy, some people take time to get used to it. (13)

Nutritional yeast can’t give you a yeast infection, since the yeast is dead. With raw brewers and baking yeast, there is a risk of infection. Whether dead or alive, this species is totally different than Candida albicans and therefore, none of them can directly worsen Candida yeast infections.

In California, a warning label is required on foods and supplements if they contain more than 0.5 micrograms of lead per daily serving.

Dr. Greger of NutritionFacts.org ordered independent lead tests for 8 major brands and here were the results:

Lead Content In Major Nutritional Yeast Brands
Brand Amount
Bragg None Detected (<0.01 ppm)
Bob’s Red Mill None Detected (<0.01 ppm)
Red Star None Detected (<0.01 ppm)
NOW Foods None Detected (<0.01 ppm)
Dr. Fuhrman None Detected (<0.01 ppm)
KAL 0.011 ppm
Whole Foods 0.012 ppm
Frontier Co-Op 0.021 ppm
Source: Independent lab testing using standard practices (Official Methods of Analysis) set by AOAC International. (14)

All of these are less than the California Prop 65 disclosure requirement, though it is interesting to see that some brands have detectable levels of lead.

For those eating several servings per day, this is a potential danger to be aware of. In that case, the cumulative amount of lead would be high enough to trigger a CA Prop 65 warning. However since the nutrition facts label only lists one serving per day, it doesn’t.

Where to buy and which brand is best?

Given the findings of Dr. Gregor’s lead tests, you should choose one of the brands which had no detectable lead levels. Those were Bragg, Bob’s Red Mill, Dr. Fuhrman, NOW Foods, and Red Star.

Among them, our favorite nooch brand is Bragg. Along with Red Star, it has the longest history for being sold as a food or supplement. It’s made in the USA and provides high amounts of essential B vitamins, including B12 which can elusive to vegans and vegetarians.

organic tempeh scramble mad with Bragg yeast and amino acids

Here we used it to flavor a turmeric tempeh scramble for breakfast.

At our local Whole Foods store, even though they have a large display for Bragg apple cider vinegar, they don’t carry their nooch. Instead they have KAL and Whole Foods brand. That said, inventory varies by location and you may be able to find it at your local Whole Foods, as well as most vitamin and health food stores/co-ops.

Walmart stocks Red Star nutritional yeast flakes in a shaker at some locations.

On Amazon you can get the popular 4.5 oz shaker of Bragg flakes.


These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.