gluten free thickeners potato starch in a glass bowl
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10 Gluten-Free Thickening Agents Perfect for Baking, Soups and Sauces

Whether it's a too-thin soup or a sauce that's a bit on the runny side, these gluten free thickeners will save the day!

When you are living a gluten-free lifestyle, it can be a never-ending battle to find ways to get your food to taste…well…normal. And when you want to make gravy, a fruit pie, a sauce or even a stew, part of making it taste "normal" is choosing the right gluten-free thickening agent and knowing how to use it.

Fortunately, there are several a variety of gluten-free thickeners to choose from.

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Which Thickener is good for Thickening Soup?

Even though many of these gluten free thickening agents are interchangeable, for thickening soup there are two ways to go:

For a non-dairy soup, use arrowroot starch.

For a dairy based soup, cornstarch would be a good alternative.  

Can gluten free flour be used as a thickening agent?

Gluten free flour mix, such as the one found here on Gluten-Free-Bread, not only makes amazing gluten free crescent rolls and gluten free biscuits, but it's also an excellent thickener. But, like with cornstarch, mix it with cool water first before adding the mixture into the sauce or soup to thicken it. 

List of Gluten Free Thickeners for Baking, Soups, Sauces and Gravy

1. Cornstarch

gluten free thickeners cornstarch in a glass bowl


Even cooks who aren't gluten free probably have a box of this staple in their pantry. Cornstarch is great for sauces and gravies, and it also gives baked goods structure and a soft texture.

 

 

Cornstarch tip: Cornstarch doesn't mix well with ingredients that are acidic, such as sour cream or wine. Arrowroot goes better with these. And, if you are using cornstarch for sauce or gravy, mix it with cold water first. If you add it directly into the hot liquid it will clump.

2. Tapioca Starch

gluten free thickeners tapioca starch in a black bowl


It can be rather confusing, but this is sometimes called tapioca flour. Tapioca starch is known for its sweeter flavor, which makes it perfect for use in fruit pies. Often, foods such as this gluten free artisan bread are not necessarily sweet but still made with tapioca starch.

Tapioca tip: Tapioca flour and tapioca starch are the same thing - different brands use different names. My go-to brand calls it tapioca flour.



3. Arrowroot Starch

gluten free thickeners arrowroot starch in a measuring cup


This starch has very little taste to it, which makes it good as a thickener for non-dairy based sauces. It's also good in puddings, soups, and this gluten free peach cobbler.

Arrowroot tip: If you want to freeze a sauce to use later, this is the starch to use. It holds up well during both the freezing and the thawing. Also, when you are cooking a sauce with arrowroot, make sure you don't overheat it or it will lose its thickening properties. Sauces made with arrowroot should be cooked on low and taken off of the heat promptly. 

What brand is best? Anthony's Arrowroot Starch is an excellent variety.

4. Potato Starch

gluten free thickeners potato starch in a glass bowl


Potato starch, like arrowroot, is almost tasteless. It's great to use in soups, stews, and sauces. Potato starch makes spongy and light baked goods because it absorbs moisture well.

Potato starch tip: Don't use potato starch in recipes that require boiling, it can withstand high temperatures, just not boiling. Make sure you don't confuse potato flour with potato starch! But if you're wondering what the differences are, this article about potato starch and potato flour substitutions is super helpful.

What brand is best? This certified gluten free variety works wonderfully.

5. Xanthan gum

bowl of gluten free thickener xanthan gum

Xanthan gum is an excellent binder, made by fermenting corn sugar with Xanthomonas campestris, a microbial. As strange as that process sounds, it is safe to consume. But even though xanthan gum is completely safe, it sometimes causes more digestion problems and just doesn't sit well with some people... if that is the case, switch to another gluten free thickener like arrowroot.

Xanthan gum tip: With xanthan gum, you have to measure carefully and not overdo it or else you risk gummy, heavy, or slimy baked goods. Also, because it is made with corn, people with corn allergies or sensitivities may want to substitute xanthan gum.

What brand is best? This one is dependable and even though it' a bit pricey, one bag will last a long time.

All of these thickeners are fairly common and easy to find. Here are some of the more unusual gluten-free thickening agents….

Guar gum

Guar gum has some incredible water-absorbing properties. It's about eight times stronger than cornstarch as a thickener. 

Guar gum tip: Like xanthan gum, measure carefully when using guar gum. If you use too much, you may end up with stringy baked goods. 

7. Water chestnut starch

This unusual starch is a lot like cornstarch in that you need to mix it with water before using. It works really well for frying tofu. 

8. Sweet potato starch

Sweet potato starch is a little more challenging to find and a lot pricier too. Asian supermarkets or online stores would be the best bet though. It can be directly substituted for potato starch. 

9. Agar powder

Agar powder is great to use in making gelatin or gel based foods. Anything else, steer clear. Because it is so good at making things 'gel' it can be hard to know what the correct proportion is to add as a gluten free thickener, until it's too late!

10. Kudzu powder

Kudzu powder comes in big chunks; you'll need to add powder to cold water and stir it into a paste before you add it to soup. Add towards the end of cooking, and make sure you stir consistently while heating. (By the way, kudzu, when drunk as a tea, is also said to help digestion and relieve fatigue.)

When you are cooking without gluten, you have lots of thickening agents to choose from. From cornstarch to tapioca starch, gluten free thickeners are there to save the day!

Wanting more gluten free baking tips? We've got lots more here:

And check out these delicious recipes:

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32 Comments

  1. Do you have a recommendation for a gluten free substitute for clear jel in a marionberry pie? I have a recipe someone gave me 15-20 years ago that calls for clear jel but I can't seem to find it locally.

    Reply

    1. Hi Keri,

      Yes, so I've have success with regular, flavorless gelatin or even cornstarch.

      Is the pie filling baked? Cornstarch will need heat to activate, otherwise gelatin would work without heat.

      ~Christine

      Reply

        1. Great - just start small and watch how it thickens before adding the filling to the crust. It'll thicken as it bakes as well.

          Enjoy it!
          ~Christine

          Reply

  2. Hi Christine,
    I have a very old family recipe for mustard pickles and it calls for 2 cups of flour and 1/2 c of corn starch mixed with vinegar to make thickening paste. After reading your post about thickening agents, I’m confused on which one to use.
    Please help.
    Thx, Barb

    Reply

    1. Hi Barb,

      Thanks for asking. So for that, I would suggest using a gluten free flour mix for the flour. Something like King Arthur Measure for Measure gluten free flour is dairy free as well, if you need that too.

      Let me know if you think of any other questions.

      Christine

      Reply

        1. Hi Lise,

          I haven't experienced that with arrowroot. I've tested it with dairy-free cream sauces.

          Hope that helps!

          Christine

          Reply

  3. It would be so nice to have a chart for reference. Have you seen or developed yourself something like that. This is definitely confusing. Thanks

    Reply

  4. This is a great list, (and I thank you for it), but what is lacking is how much to use in each substance when we are substituting flour. I often wing it (such as in soups and sauces), but in some instances (such as baking) I need a more precise amount.

    Sweet rice flour is supposed to be a 1:1 sub, so I'm using that in a vegan shephard's pie recipe tonight.

    Reply

  5. Would instant oatmeal work or cream of rice? I’ve used sweet potatoes, they cook quickly and mashed, thicken quite well.

    Reply

    1. Hi Leslie,

      So both could work, I just haven't tested them. I would imagine if it's a soup with a texture, either could work. Something more thin might contribute too many lumps.

      Hope that helps!

      Christine

      Reply

  8. You caught me by surprise with "kudzu powder". Here in the southern states, kudzu is known as the notorious creeping vine that can, if left to its own devices, engulf entire forests and buildings. You'll frequently see herds of goats on public land whose sole function is to eat that devil plant. Interesting to know it has an actual use!!

    Reply

    1. Hi Mandy,

      That's funny that you bring it up - I'm in the South too, so yep, it *can* be beneficial 🙂

      ~Christine

      Reply

    1. Hi Lyn,

      Thanks for asking - so it will depend on the recipe but typically, xanthan gum or another binder like psyllium husk powder would substitute for vital wheat gluten.

      Hope that helps!

      Christine

      Reply

  11. Thank.you. Hopefully gravy made with sweet rice flour will reheat with the turkey and gravy better than cornstarch.Carol

    Reply

  12. I use agar agar for my breads and it comes out just fine. I sub it straight across for xanthan gum. Try it!

    Reply

  13. Thank you for posting your experience with sweet rice flour. I just tried it and it worked great. I’ve always used corn starch but I don’t have any. Made some broccoli cheddar soup and it’s delicious ?

    Reply

  14. My go to thickener for gravies and sauces is sweet rice flour aka glutinous rice flour. It behaves very much like wheat flour IMO.

    Reply

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