How to Find a SIBO-Friendly Protein Powder

📌 Overview and Key Takeaways

This is a Certified Nutrition Coach’s guide on how to find a SIBO-friendly protein powder.

Discover how to safely meet your protein needs while managing small intestinal bacterial overgrowth.

Last Updated
Jul 21, 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.

Protein Powder for SIBO

Is Protein Powder Good for SIBO?

Yes, protein powder can be beneficial for people with SIBO when chosen carefully.

Small intestinal bacterial overgrowth (SIBO) happens when too many bacteria grow in the small intestine, particularly bacteria that normally live in other parts of the gut.

This overgrowth can cause bloating, diarrhea, stomach pain, malnutrition, and weight loss.

Although SIBO remains poorly understood, there is a treatment, which involves:

1. Correcting the underlying cause through dietary, surgical, or medical therapies.
2. Providing nutritional support, for individuals with deficiencies or weight loss.
3. Treating the overgrowth with antibiotics.

Note that antibiotics do not fix the root cause, so doctors often also recommend dietary changes.

In most cases, they recommend the SIBO diet, which is a temporary elimination diet designed to help identify foods that trigger symptoms.

They might also recommend nutritional supplements, as nutrient malabsorption can occur as a consequence of SIBO (Curr Pharm Des, 2025).

In serious cases, bacteria in the gut can compete with the body for protein, and damage to the gut lining caused by SIBO can cause protein losses (Gastroenterology, 2020).

Some patients might therefore need to meet higher protein needs in particular, which is where protein powder can help.

Protein powder makes it easy to fill in nutritional gaps.

It can be mixed with just milk or water, or added to smoothies, oatmeal, and other recipes.

Not all protein powders work well for people with SIBO, however.

What Is the Best SIBO Protein Powder?

Many protein powders contain ingredients that can cause painful digestive issues and even contribute to the development of SIBO.

They include food additives, dairy-based proteins, and protein concentrates and isolates.

🚫 Avoid Food Additives

Ultra-processed food additives like emulsifiers, thickeners, and artificial sweeteners can upset your stomach.

They can also change the composition and function of your gut microbiome (North Clin Istanb, 2020).

These shifts, known as gut dysbiosis, have been linked to SIBO development (Microorganisms, 2023).

In fact, SIBO is a specific type of gut dysbiosis.

SIBO affects bacteria in the small intestine specifically, while gut dysbiosis refers to bacterial imbalances anywhere in the digestive tract.

⚠️ Common food additives in protein shakes and powders include:

• 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 should not be in your protein powder.

🚫 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 a sensitive stomach, you might also want to avoid protein concentrates and isolates.

Most protein shakes and powders 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 shakes and powders made from minimally-processed protein sources like egg whites and almonds.

They are more gut-friendly.

Order Samples to see for yourself.

Sources

1. Gastroenterology & Hepatology (Gastroenterol Hepatol (N Y)). Small intestinal bacterial overgrowth: a comprehensive review. 2007.
2. Gastroenterology (Gastroenterology). AGA Clinical Practice Update on Small Intestinal Bacterial Overgrowth: Expert Review. 2020.
3. Current Pharmaceutical Design (Curr Pharm Des). Small Intestinal Bacterial Overgrowth (SIBO) – Prevention and Therapeutic Role of Nutrition, Prebiotics, Probiotics, and Prokinetics. 2025.
4. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2020.
5. Microorganisms (Microorganisms). Association between Gut Dysbiosis and the Occurrence of SIBO, LIBO, SIFO and IMO. 2023.
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: A Randomized, Controlled, Double-Blind Pilot Study. 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 High and Low Carbohydrate Conditions. 2024.

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This article was written by a Certified Nutrition Coach and reviewed by a Registered Dietitian. We rely on peer-reviewed research and trusted medical sources, and regularly update our content to ensure accuracy and clarity.