How to Find the Best Gluten-Free Protein Powder

📌 Overview and Key Takeaways

This is a Certified Nutrition Coach’s guide on how to find the best gluten-free protein powder.

Discover how to meet your protein needs on a gluten-free diet.

Last Updated
May 13, 2026

Author and Medical Reviewer

Written by Jack, CNC

Jack is a National Academy of Sports Medicine Certified Nutrition Coach.

Disclaimer: This article is for general informational purposes only and is not a substitute for personalized medical advice. Consult a licensed healthcare professional before making changes to your diet.

Gluten-Free Protein Powder

Why Might You Want to Avoid Gluten?

You might want to avoid gluten for three medically-recognized reasons: celiac disease, wheat allergy, and non-celiac wheat/gluten sensitivity.

• Celiac disease is an autoimmune disorder triggered by gluten (a protein in wheat, barley, and rye), leading to intestinal inflammation, malabsorption, and a wide range of digestive symptoms.
• Non-celiac gluten sensitivity is characterized by symptoms such as bloating, fatigue, and headaches in the absence of celiac disease.
• Wheat allergy involves an immune response to wheat proteins, including gluten, which can cause sudden symptoms like hives, swelling, respiratory issues, and in severe cases, anaphylaxis.

There is also evidence that gluten-free diets can help with certain conditions, such as dermatitis herpetiformis, as well as some autoimmune or neurological conditions, though the evidence varies (Neurology, 2017).

Additionally, some people report improvement in chronic digestive symptoms, such as those seen in irritable bowel syndrome (IBS), when avoiding gluten, even without a formal diagnosis of the above conditions.

Keep in mind that mainstream nutrition research does not support gluten avoidance for people without a medical reason, as gluten-free foods are often lower in fiber and other nutrients than their conventional counterparts.

Is Protein Powder Gluten-Free?

Most protein powders are gluten-free.

But to be sure, you must read the ingredient list.

Avoid ambiguous ingredients like “modified food starch,” “maltodextrin,” or “dextrin” as these can be derived from wheat.

You should also be careful with fiber or prebiotic “blends” and natural flavors, as they can contain ingredients that come from wheat.

And unless they are certified gluten-free, be careful with oats, as contamination with gluten can occur during processing.

Some protein powders are certified gluten-free, meaning they contain less than 10-20 ppm of gluten.

Look for a “Certified Gluten-Free” seal on the label from organizations like GFCO.

It is important to note because the ongoing cost of certification is prohibitively expensive for small brands, some choose to outsource testing to a third-party lab.

This is what we do, and we publish the gluten testing results on our website.

All that said, just because a protein powder is gluten-free does not mean that it is gut-friendly.

What Is the Best Protein Powder for a Gluten-Free Diet?

Not all gluten-free protein powders are created equal.

In most cases, as long as you get protein from a variety of sources, there is no advantage to using one type of protein powder over another in the long-term (J Nutr, 2023).

Ingredients do matter, however, especially if you have pre-existing gut issues.

Ultra-processed food additives, for example, might contribute to (exacerbate) chronic gut issues.

🚫 Avoid Food Additives

Regularly eating emulsifiers, thickeners, artificial sweeteners, and other ultra-processed additives can alter the composition and function of your gut microbiome (North Clin Istan, 2019).

These shifts, known as gut dysbiosis, have been linked to the development of chronic digestive issues like IBS (JGH Open, 2021).

Some preliminary research suggests that the gut microbiome might play a role in the development of celiac disease, however it requires further investigation (Eur J Nutr, 2020).

Specifically, gut dysbiosis has been identified as a potential co-factor for genetically predisposed individuals.

⚠️ Here is a list of the most common food additives in protein supplements:

• acacia fiber
• acacia gum
• acesulfame potassium
• artificial flavors
• ascorbic acid
• aspartame
• calcium carbonate
• carrageenan
• cellulose gum
• dextrin
• dicalcium phosphate
• dipotassium phosphate
• erythritol
• gellan gum
• guar gum
• gum arabic
• inulin
• locust bean gum
• maltitol
• maltodextrin
• mono- and diglycerides
• ‘natural’ flavors
• rice bran extract
• rice dextrin
• rice hulls
• rosemary extract
• silica
• silicon dioxide
• sodium alginate
• soluble corn fiber
• sorbitol
• soy lecithin
• sucralose
• sunflower lecithin
• tocopherols
• tricalcium phosphate
• xanthan gum
• xylitol
• zinc oxide

As a rule of thumb, if you cannot find an ingredient in nature or make it at home, it is a food additive.

🚫 Avoid Dairy-Based Proteins

Dairy-based proteins like whey and casein, although not a problem for everyone, can cause digestive issues too.

This is usually because they contain lactose – a sugar many individuals with sensitive stomachs cannot fully digest.

But you might be sensitive to dairy-based proteins even if you are not lactose intolerant.

For starters, the digestion of some caseins releases a bioactive peptide that has been linked to digestive issues (Adv Nutr, 2017).

Casein also forms a gel-like substance in your stomach that slows down digestion (Crit Rev Food Sci Nutr, 2023).

For sensitive individuals, particularly true for those with cow’s milk protein allergy or intolerance, slower digestion can contribute to bloating, constipation, and other side effects.

🚫 Avoid Protein Concentrates and Isolates

If you have pre-existing gut issues or even just a sensitive stomach, you might also want to avoid protein concentrates and isolates.

Most protein supplements are made from one or both of these ultra-processed protein sources, which have been mechanically and/or chemically stripped of everything but the protein.

This includes the enzymes, fiber, and other natural digestive aids that help you break them down.

You therefore do not digest them in the same way that you do whole foods, which could affect your gut health.

For example, one study shows that regularly consuming protein concentrates and isolates might disrupt your gut microbiome (Nutrients, 2018).

Another study shows that it could cause the formation of toxic byproducts in your gut (Mol Nutr Food Res, 2024).

Although further research is needed, individuals with sensitive stomachs can play it safe by choosing protein supplements made from minimally-processed protein sources like egg whites and almonds.

They are more gut-friendly.

Order Samples to see for yourself.

Sources

1. Neurology Journals (Neurology). Effect of gluten-free diet on cerebellar MR spectroscopy in gluten ataxia. 2017.
2. Journal of Nutrition (J Nutr). Vegan and Omnivorous High Protein Diets Support Comparable Daily Myofibrillar Protein Synthesis Rates and Skeletal Muscle Hypertrophy in Young Adults. 2023.
3. Northern Clinics of Istanbul (North Clin Istan). Food additives and microbiota. 2019.
4. European Journal of Nutrition (Eur J Nutr). Role of the gut microbiota in the pathogenesis of coeliac disease and potential therapeutic implications. 2020.
5. Journal of Gastroenterology and Hepatology Open (JGH Open). Gut microbiota dysbiosis in functional gastrointestinal disorders: Underpinning the symptoms and pathophysiology. 2021.
6. Advances in Nutrition | Journal (Adv Nutr). Systematic Review of the Gastrointestinal Effects of A1 Compared with A2 β-Casein. 2017.
7. Critical Reviews in Food Science and Nutrition (Crit Rev Food Sci Nutr). Milk proteins: Processing, gastric coagulation, amino acid availability and muscle protein synthesis. 2023.
8. Nutrients (Nutrients). Effect of a protein supplement on the gut microbiota of endurance athletes. 2018.
9. Molecular Nutrition & Food Research (Mol Nutr Food Res). In vitro fermentation of animal and plant protein isolates by the human gut microbiota under low and high carbohydrate conditions. 2024.

Editorial Guidelines

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Our articles are written by a Certified Nutrition Coach and medically reviewed by a Registered Dietitian. We rely on peer-reviewed research and trusted medical sources, and we regularly update our content to ensure accuracy and clarity.