How to Find the Best Protein Powder for Lactose Intolerance

📌 Overview and Key Takeaways

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

Discover how to safely meet your protein needs without lactose.

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 Lactose Intolerance

Lactose is a sugar found in milk and dairy products like yogurt, ice cream, and whey protein.

It forms when two simpler sugars, glucose and galactose, combine.

To digest lactose, your body needs an enzyme called lactase.

Lactose intolerance occurs when your body does not produce enough lactase.

About two-thirds of the world’s population has some degree of lactose intolerance (Food Funct, 2018).

If you have lactose intolerance, you might experience bloating, diarrhea, stomach pain, and other digestive issues after eating dairy products.

As the name suggests, lactose-free means a product contains no lactose.

This is achieved by adding lactase, which breaks down the lactose.

Because the lactose is fully broken down, it is considered “lactose-free” for practical and regulatory purposes.

Lactose-free does not always mean dairy-free, however.

This distinction matters if you have a dairy allergy, which is different from lactose intolerance.

Dairy-free products are always lactose-free since they contain no milk ingredients.

Which Protein Powders Are Lactose-Free?

Cow’s milk proteins like whey and casein are byproducts of cheese and yogurt production.

They contain lactose, so if you have lactose intolerance, avoid protein powders made from whey and casein.

People with severe lactose intolerance should also avoid goat’s milk protein.

While goat’s milk contains less lactose than cow’s milk, it can still cause digestive problems.

It is worth adding that dairy-based food additives like sodium caseinate contain small amounts of lactose.

I should also note that you might be sensitive to dairy-based protein, particularly casein protein, 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.

There are several types of lactose-free protein powder.

Common options include egg white and plant-based protein powders.

If you eat a balanced diet with varied protein sources, the type of protein powder you choose does not matter in the long-term.

Ingredients do matter for digestion, however.

Many lactose-free protein powders contain ingredients that can cause painful digestive issues and even long-term gut health problems.

The top offenders are ultra-processed food additives and protein concentrates or isolates.

🚫 Avoid Food Additives

Regularly consuming emulsifiers, thickeners, and other ultra-processed additives can change the composition and function of your gut microbiome – the community of bacteria living in your digestive system (North Clin Istanb, 2020).

These shifts, known as gut dysbiosis, have been linked to chronic digestive problems like IBS (irritable bowel syndrome) (JGH Open, 2021).

It can also further impair your ability to digest lactose (Gut, 2019).

⚠️ Here is a list of the most common food additives in protein shakes and powders:

• 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 in your kitchen, it is probably a food additive.

🚫 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. Food & Function (Food Funct). Lactose malabsorption and intolerance: a review. 2018.
2. Advances in Nutrition | Journal (Adv Nutr). Systematic Review of the Gastrointestinal Effects of A1 Compared with A2 β-Casein. 2017.
3. 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.
4. The Journal of Nutrition (J Nutr). Amino Acid Intake and Conformance With the Dietary Reference Intakes in the United States: Analysis of the National Health and Nutrition Examination Survey, 2001-2018. 2023.
5. Journal of the International Society of Sports Nutrition (J Int Soc Sports Nutr). Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomized, Placebo-controlled clinical trial vs. Whey protein. 2015.
6. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2020.
7. JGH Open (JGH Open). Gut microbiota dysbiosis in functional gastrointestinal disorders: Underpinning the symptoms and pathophysiology. 2021.
8. Gut (Gut). Update on lactose malabsorption and intolerance: pathogenesis, diagnosis and clinical management. 2019.
9. Nutrients (Nutrients). Effect of a Protein Supplement on the Gut Microbiota of Endurance Athletes: A Randomized, Controlled, Double-Blind Pilot Study. 2018.
10. 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.