How to Find the Best Protein Powder for Leaky Gut

📌 Overview and Key Takeaways

This is a Certified Nutrition Coach’s guide on how to find the best protein powder for leaky gut.

Discover how to safely meet your protein needs with a leaky gut.

Last Updated
Mar 28, 2026

Author and Medical Reviewer

Written by Jack, CNC

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

Medically reviewed by Brittany, MS, RD and Jenn, PA-C

Brittany is a Registered Dietitian with a MS in Nutrition.

Jenn is a Physician Assistant with a BA in Nutritional Sciences.

Protein Powder for Leaky Gut

Can Protein Powder Cause Leaky Gut?

Leaky gut syndrome, also known as increased intestinal permeability, is a condition where your intestinal lining becomes damaged.

This allows bacteria, toxins, and undigested food particles to pass into your bloodstream.

Several studies have linked leaky gut syndrome with chronic and autoimmune diseases like type 1 diabetes and celiac disease (Front Immunol, 2017).

Leaky gut is also thought to cause symptoms like chronic bloating and diarrhea.

What exactly causes someone to have a leaky gut is somewhat of a mystery.

There are several ways to improve symptoms, however, including diet and lifestyle modifications.

Many people find that avoiding certain foods, like refined carbohydrates, dairy, caffeine, and artificial sweeteners, helps reduce leaky gut symptoms.

Eating foods known to promote a healthy gut microbiome, like fermented foods, might also make a difference.

A healthy gut microbiome influences the production of mucins, which are the proteins that form the protective mucus layers of your intestinal barrier (Lancet Gastroenterol Hepatol, 2022).

For this reason, if you consume protein powder regularly, you have to be very careful about what is in it.

Protein powders that affect the composition and function of your gut microbiome can impact how your intestinal barrier functions.

This is not to say that protein powder causes leaky gut, as the relationship between protein supplementation, microbiome changes, and barrier integrity is complex.

It is a good reason to read the ingredients closely, however.

Is Protein Powder Good for Leaky Gut?

The relationship between leaky gut and nutrient absorption is complex.

Increased intestinal permeability can lead to nutritional deficiencies and weight loss.

To counteract this, you should be mindful of your nutrient intake.

Protein intake is especially important as dietary proteins are essential for the growth and repair of your mucosal intestinal barrier (Adv Exp Med Biol, 2020).

Note that there is no established specific protein requirement for “leaky gut,” per se.

But for patients with documented increased intestinal permeability in the context of inflammatory bowel disease (IBD) or malnutrition risk, protein requirements are 1.2-1.5 grams per kilogram of bodyweight per day (Lancet Gastroenterol Hepatol, 2023)

This is much higher than the general population recommendation of 0.8 g/kg/day.

And for some people, especially those with dietary restrictions, eating enough protein can be hard.

This is where protein powder can help.

Incorporating a protein powder into your diet is an easy way to fill in nutritional gaps.

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

Not all protein powders are created equal, however.

What Is the Best Protein Powder for Leaky Gut?

Many protein powders are made with ingredients that could contribute to a leaky gut.

Among these problematic ingredients are food additives and protein concentrates and isolates.

🚫 Avoid Food Additives

Regularly eating emulsifiers, thickeners, artificial sweeteners, and other ultra-processed additives can alter the composition of your gut microbiome (North Clin Istanb, 2020).

These shifts, known as gut dysbiosis, have been associated with the development of leaky gut (Molecules, 2023).

Gut dysbiosis, which is basically an imbalance in gut bacteria, weakens the intestinal barrier in several ways:

• Beneficial bacteria produce fewer protective compounds
• Proteins that seal gaps between gut cells get disrupted
• Harmful bacteria multiply and trigger inflammation.

The result is a more permeable gut lining that allows toxins and other harmful compounds to seep into the bloodstream.

⚠️ 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 it in nature or make it at home, it is probably a food additive.

🚫 Avoid Protein Concentrates and Isolates

If you have a sensitive stomach, you might also want to avoid ultra-processed protein concentrates and isolates.

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

This process removes the enzymes, fiber, and other natural digestive aids that help your gut break them down.

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

For example, studies show that regularly eating protein concentrates and isolates might disrupt your gut microbiome (Nutrients, 2018).

They can also cause toxic byproducts to form in your gut (Mol Nutr Food Res, 2024).

People with pre-existing digestive issues should look for protein supplements made from whole food protein sources like egg whites and almonds.

They are more gut-friendly.

Order Samples to see for yourself.

Sources

1. Frontiers in immunology (Front Immunol). Leaky Gut As a Danger Signal for Autoimmune Diseases. 2017.
2. The Lancet Gastroenterology and Hepatology (Lancet Gastroenterol Hepatol). The role of mucins in gastrointestinal barrier function during health and disease. 2022.
3. Advances in Experimental Medicine and Biology (Adv Exp Med Biol). Amino Acids in Intestinal Physiology and Health. 2020.
4. The Lancet Gastroenterology and Hepatology (Lancet Gastroenterol Hepatol). Inflammation and malnutrition in inflammatory bowel disease. 2023.
5. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2020.
6. Molecules (Basel, Switzerland) (Molecules). Leaky Gut and the Ingredients That Help Treat It: A Review. 2023.
7. Nutrients (Nutrients). Effect of a Protein Supplement on the Gut Microbiota of Endurance Athletes: A Randomized, Controlled, Double-Blind Pilot Study. 2018.
8. 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.

Editorial Guidelines

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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.