Can Brewer's Yeast Repel Mosquitoes

Can Brewer’s Yeast Repel Mosquitoes?

Certain smells naturally repel mosquitoes. Brewer’s yeast is one of them, being especially high in vitamin B1, thiamine, which is excreted through your pores when you sweat.

Can brewer’s yeast repel mosquitoes?

Yes. Consumption of brewer’s yeast can repel mosquitoes due to the odor excreted by your skin. It can’t be detected by humans but it is unpleasant for mosquitoes so if you consume foods rich in thiamine, mosquitoes will leave you alone.

By increasing your consumption of thiamine you naturally repel mosquitoes.

Content of Thiamine and other nutrients in Brewer’s Yeast

Two tablespoons (30 grams) of brewer’s yeast contain approximately (according to SelfNutrition):

  • 116 calories
  • 16 grams of protein
  • 0 grams of fat
  • 13 grams carbohydrate
  • 6 grams of fiber


  • 1.2 milligrams thiamine (80 % DV)
  • 1.5 milligrams riboflavin (90 % DV)
  • 0.8 milligrams vitamin B6 (40 % DV)
  • 10 milligrams niacin (50 % DV)
  • 60 micrograms folate (15 % DV)


  • 1.5 milligrams zinc (10% DV)
  • 1 milligram of copper (50 %t DV)
  • 63 micrograms selenium (90 % DV)
  • 633 milligrams potassium (18 % DV)
  • 63 milligrams sodium (3% DV)
  • 1.1 milligrams iron (6% DV)
  • 32.0 milligrams magnesium (8% DV)

I know the primary topic of this article is whether brewer’s yeast can repel mosquitoes or not and it really can, but you have to consume it regularly at least in the time you are in an area full of mosquitoes. However, I also wanted to show you what a great (and inexpensive) source of vitamins, not only thiamine, and minerals it is. A natural one, without chemicals.


Other Sources of Thiamine

There are other food sources of thiamine which include beef, liver, pork, dried milk, eggs, nuts, oats, and other wholegrain foods, oranges, seeds, legumes, and peas. Foods are also fortified with thiamine. Some foods that are often fortified with B1 are rice, pasta, bread, cereals, and flour.



Brewer’s Yeast is not the only food that is high in thiamine, although the concentration is significantly bigger compared to other foods.

Here is a list of other foods high in thiamine as well.

FoodThiamine in 100 g
Lean pork chops0.7 mg
0.3 mg
Flax Seeds1.6 mg
Navy Beans0.2 mg
Green Peas0.3 mg
Tofu0.2 mg
Brown Rice0.2 mg
Mussels0.2 mg


You will find the amount of thiamine in foods per serving in the table below, according to the National Institute of Health.

Food Milligrams

(mg) per




Rice, white, long-grain, enriched, parboiled, ½ cup 1.4 117
Breakfast cereals, fortified with 100% of the DV for thiamine, 1 serving 1.2 100
Egg noodles, enriched, cooked, 1 cup 0.5 42
Porkchop, bone-in, broiled, 3 ounces 0.4 33
Trout, cooked, dry heat, 3 ounces 0.4 33
Black beans, boiled, ½ cup 0.4 33
English muffin, plain, enriched, 1 muffin 0.3 25
Mussels, blue, cooked, moist heat, 3 ounces 0.3 25
Tuna, Bluefin, cooked, dry heat, 3 ounces 0.2 17
Macaroni, whole wheat, cooked, 1 cup 0.2 17
Acorn squash, cubed, baked, ½ cup 0.2 17
Rice, brown, long-grain, not enriched, cooked, ½ cup 0.1 8
Bread, whole wheat, 1 slice 0.1 8
Orange juice, prepared from concentrate, 1 cup 0.1 8
Sunflower seeds, toasted, 1 ounce 0.1 8
Beefsteak, bottom round, trimmed of fat, braised, 3 ounces 0.1 8
Yogurt, plain, low fat, 1 cup 0.1 8
Oatmeal, regular and quick, unenriched, cooked with water, ½ cup 0.1 8
Corn, yellow, boiled, 1 medium ear 0.1 8
Milk, 2%, 1 cup 0.1 8
Barley, pearled, cooked, 1 cup 0.1 8
Cheddar cheese, 1½ ounces 0 0
Chicken, meat, and skin, roasted, 3 ounces 0 0
Apple, sliced, 1 cup 0 0

*DV = Daily Value.

Recommended thiamine consumption

Men need around 1.0 milligram; women around 0.8 milligrams of thiamine per day.

Can Brewer's Yeast Repel Mosquitoes_flaky brewer's yeast


My Personal Experience with Brewer’s Yeast

I found out about all the benefits of Brewer’s Yeast thanks to Adelle Davis’s books when I was studying at the university. Adelle Davis was a pioneer nutritionist and I learned a lot from her books. Since that time, I’ve been taking dried Brewer’s Yeast in form of tablets with my lunch every day and I believe it has helped me to prevent my hair from graying due to the high amount of zinc, magnesium, and selenium.

It wasn’t until recently that I realized I almost don’t get bitten by mosquitoes compared to my boyfriend when we are in a mosquito-flooded area. Of course, it doesn’t protect you a hundred percent but the amount of bites is significantly lower. The effectiveness of Brewer’s Yeast was researched and proven in this study.

How To Consume Brewer’s Yeast

There are various forms of Brewer’s Yeast: powder, flakes, liquid, or tablets.

Brewer’s yeast powder can be mixed with water or other beverages.
The average recommended dosage for adults is one to two tablespoons daily.

I prefer tablets because you can take them with you wherever you go and they are easy to consume – just like any other tablet, you have it with a glass of water or any other drink.

Recommended consumption is always described on the package.

What Is the Difference Between Brewer’s Yeast and Baker’s Yeast

Brewer’s yeast is an ingredient used for the production of beer, thus the name. It is not the same as the commonly used and known baker’s yeast. Both yeasts are made from strains of Saccharomyces cerevisiae, but each from different strains.

Brewer’s yeast and baker’s yeast are both made from strains of the Saccharomyces cerevisiae fungus, but each of them from different strains of this species. Brewer’s yeast contains chromium, which is an essential nutrient that may help regulate blood sugar, according to the Cleveland Clinic. As obvious from the tables above, it is also considered a good source of B vitamins, which are essential for our body.

Is Brewer’s Yeast the same as Nutritional Yeast

Nutritional yeast is a powdery or flaky yeast usually bought in bulk. Vegans and vegetarians enjoy it as a supplement, but others can benefit from adding it to their diets. It’s usually a form of Saccharomyces cerevisiae, which is harvested, pasteurized, and dried to deactivate it and enhance its nutritional properties. Brewer’s yeast looks similar has and is also derived from Saccharomyces cerevisiae, but it’s produced as the byproduct of beer-making. It, too, is pasteurized and deactivated. Nutritional yeast does not provide chromium, while brewer’s yeast does not provide vitamin B-12.

In the video below, Dr. Berg explains the difference between nutritional yeast and brewer’s yeast:

Are there any risks

Brewer’s yeast is a natural ingredient considered healthy and safe. However, if you are a diabetic or have any other serious health issues, you should consult your doctor.

There are several cases reported of decreased postprandial glucose in diabetics after taking brewer’s yeast.

Other Benefits of Consuming Brewer’s Yeast

Brewer’s Yeast can help with health issues such as diarrhea caused by antibiotics, traveler’s diarrhea, irritable bowel syndrome, lactose intolerance, and others. It may also maintain healthy skin, hair, eyes, and mouth and enhance the immune system.


Summary: Should You Consume Brewer’s Yeast To Repel Mosquitoes?

Brewer’s yeast is an inexpensive and excellent source of thiamine that is excreted with sweat; the odor is not pleasant for mosquitoes so you are safer than if you don’t have enough thiamine in your body.

You can increase the amount of thiamine that you consume in other foods such as salmon, trout, tuna, flax seeds, beef, green peas, and other sources mentioned above but thiamine content in Brewer’s Yeast is higher and you can be sure that if you take one or two tablets a day (I take two or three), you are taken care of.

Nevertheless, if you want to be safe from bites completely, it’s best to go for an external repellent as well. Unfortunately, the only one that protects you 100% no matter who you are and what you consume, is a chemical repellent based on deet.

Deet can irritate your skin and excessive exposure can be toxic. You can use a natural alternative to deet instead: Tea Tree Oil. Here is an article about natural insect bug sprays and my experience with tea tree oil: How To Keep Mosquitoes Away Naturally.

11 thoughts on “Can Brewer’s Yeast Repel Mosquitoes?

  1. I never knew there was a natural way to repel mosquitoes. Fortunately, my mother and I never really had issues with mosquitoes being drawn to us, but my father certainly has. They seem very attracted to him for some reason. At least compared to us. 

    My parents have talked about going camping every once in a while, so I might go recommend Brewer’s Yeast to my father. Or at the very least talk to him about the foods that can increase his thiamine consumption.

  2. Hi

    Who does not hate being bitten by mosquitoes,  as the number of diseases they can bring is truly outstanding. It is great to hear that their is a way to deter them naturally and from a product that you can readily buy from a health food store. I find the article to be well written and full of information that can be used to make an informed decision.  I do not know if it will work for everybody but I do know some people seem not to be attacked, whilst others seem to be covered head to tail in bites. If it helps these people, I say go for it.

    What should you do if mosquito still bite you even if you take brewers yeast and nothing seems to work?

    1. I can share what I do when I’m bitten (as I said in the article, it doesn’t protect you completely but it decreases the amount of bites significantly). I use tea trea oil on the bites. Tea tree oil 1. repels mosquitoes as well, 2. reliefs the itching. Hope it helps.

  3. This was a really interesting article. I had no idea brewer’s yeast had some sort of use like this- I must say though couldn’t it be bad to be taking this much yeast? Not sure but nevertheless awesome information. I didn’t find many links for what you’re talking about- maybe include some more so we know where to get it?

    1. I understand that it might seem a lot but it is a natural source and if you take the amount of tables or flakes as recommended on the package, it is as if you were eating other foods. I’ve been taking brewer’s yeast tablets for years (as mentioned in the article) and believe it’s one of the reasons I managed to keep my youthful appearance 🙂 However, if you are still concerned, you can reach for other sources of thiamine instead. 
      I’m sorry I didn’t add any link to brewer’s yeast, here is one on the Amazon of great quality in tablet form: Natural Brewer’s Yeast 

      1. Thank you so much for the response. I loved the article as it was super informative. You have a lot of great beauty and anti-aging secrets. Love it!

  4. Hi, Lenka,

    It was a very interesting read. I didn’t know brewer’s yeast has so many properties. I’m particularly interested in its properties against mosquitoes. They always bite me when I’m outside. I recently started working out outside, and I can’t concentrate on my workout.

    I also didn’t know that it helps fight graying hair. I think I need to start consuming it.

    What does it taste like? I don’t recall ever trying it alone, only beer. I guess I prefer tablets. They’re easier and more convenient.

    Thanks for sharing!

    1. Hi Enrique,
      I also prefer tablets and take them with me everywhere I go because I’m really used to have to have them after my lunch. I think they also support digestion just like beer.
      To me, they smell like dried yeast. I’ve also tried nutritional yeast years ago and the taste was better, more cheesy like I would say, but it was flakes and you have to mix it with a drink or add it to a soup or sauce, not so comfortable. So I got back to brewer’s yeast. It really is a great and cheap natural supplement loaded with so many nutrients that it’s worth consuming.

  5. This was certainly an interesting read, I really enjoy a read when it’s broken down into content-related things like what is contained in something.

    I had no idea that yeast could repel mosquitos, although living in the UK they are not really something I personally have an issue with and I definitely don’t travel much. However, this was important and interesting information for me.

    I found it useful that you listed other foods that contain the needed things to repel them also in case you didn’t wish to or couldn’t take what the article was talking about. Very well written and informative.



  6. Wow, I didn’t know that brewer’s yeast can be used as a mosquito repellant! This is very interesting for me because we live in a place where mosquitos are all over during the summer. I am not a mosquito favorite, but my husband and our 2 kids are! I really feel bad seeing them with a lot of mosquito bites. I was also researching for a more natural alternative because I’ve read that DEET is bad. I had tried making a mixture with essential oils, but it wasn’t that effective. So, I bought a chemical spray with DEET even if it’s against my will. 🙁

    I’ll give the brewer’s yeast a try next summer and hope that it will work for us. Is brewer’s yeast safe for kids to take?

    1. Yeah, it is safe, but you can also focus on other foods that contain vitamins B and combine them. It seems that’s what mosquitos don’t like.

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