test the gluten content of your beer

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Guinness Gluten Test

Today I tested the famous Guinness Extra Stout beer. I occasionally drank draught Guinness in bars but I never tried it in bottles before. Well, a good Guinness is best served in an old pub with friends coming in a pint glass with a creamy, dome-shaped head. For a gluten test the bottled Guinness will do it as the ingredients should be the same.

Beer: Guinness
Producer: St. James’s Gate Brewery/Diageo
Originating country: Ireland
Brewing location: Ireland
Bottle size: 0.33 l = approx. 11 Oz.
Alcohol by volume: 4.1%
Ingredients: water, barley malt, roasted barley, hops, yeast (translated from German)

Guinness Gluten Test Guinness Gluten Test

Test Kit: Imutest Gluten-in-Food Kit

Test result: There is a clearly visible pink test spot on the left of the test area ( T ) which indicates the presence of gluten. According to the instructions a “very low gluten” level of 20 to 100 ppm should give a test spot which is weaker or similar in intensity to that of the control spot ( C ). Please find some more information here. The test spot appears lighter than the control spot.

Guinness Gluten Test

On a scale from 1 to 20 I would rate Guinness 3/4 so in this test it has around 20-30 ppm. Even though this test is positive please note it is not a medical advice – see my facts page.


Merry Christmas and Happy New Year


Poll: Which American light beer do you want me to test next?


  1. Jacquie

    This result hurts my heart 🙁

  2. Mae

    I was really hoping Guinness would come in lower. I really miss it in my Irish dishes now that I have been diagnosed with Celiac.

  3. Susan Graham

    I have gluten intollerance.
    Here is the really good news for all beer lovers.
    We live in Belgium and here they brew a fine, organic glutenfree amber beer named Brunehaut amber; the same brewery also makes blond, triple (stronger (8%) blond) and white … and a “season”al top yeast bear (slightly sour). The last three have no Wheat in them at all.

    Another Brewery “slaapmutske” makes a very fine dark beer that is glutenfree, it tastes full bodied , soft and malty in taste with hints of caramel, we use it in stews. It may be a glutenfree substitute for guinnes and other dark beers.

    • Avatar photo

      Hi Susan, thanks for the tips. Hope I will get the chance to the try the beers you listed. Cheers Steffen

  4. Mike

    its worth noting this test is on Guiness Extra Stout, NOT Guiness Draft. I have an auto immune disease and am sensitive to gluten and I can have Guiness Draft. This site says that Guiness draft is actually less than 5ppm! http://smartgurlsolutions.com/2018/04/16/guinness-stout/ hopefully folks can start drinking away!

    • Avatar photo

      Thanks Mike, this is awesome. I didn’t know there was another site testing Guinness. And I would love to have an extra cold Guinness again 🙂
      Cheers Steffen

  5. andrew fuller

    So what is the gluten ppm of a pint of Guinness poured in a pub?
    All I can find is the data for cans or bottles.
    Has anyone tried it?

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