How to Find the Best Protein Powder for Mounjaro

📌 Overview and Key Takeaways

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

Discover how to safely meet your protein needs while on tirzepatide.

Last Updated
Jun 2, 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 Mounjaro

Are Protein Shakes Good for Individuals on Tirzepatide?

Mounjaro is a prescription medication used to treat type 2 diabetes.

Its active ingredient, tirzepatide, is a once-weekly injection that mimics two natural hormones to regulate blood sugar and reduce appetite.

While approved primarily for blood sugar control, it might also lead to significant weight loss and is increasingly used off-label for obesity management.

A higher-dose version of tirzepatide, called Zepbound, is FDA-approved specifically for weight loss.

It is important to note that Mounjaro is most effective when paired with lifestyle and dietary changes.

One such change is increasing the percentage of your calories that come from protein.

Research suggests that a high protein diet might have advantages for both diabetes and weight loss because it could improve blood sugar management, insulin sensitivity, and satiety (Nutrients, 2021).

Eating enough protein is also important for maintaining muscle mass while on Mounjaro.

If your protein intake is too low, your body might start to break down muscle instead of fat for energy, which is why studies have shown that GLP-1 receptor agonist treatment could result in significant reductions in muscle mass (Eur Rev Med Pharmacol Sci, 2023).

Keep in mind that you should try to get as much protein as you can from foods like eggs and fish.

If dietary or lifestyle restrictions make consuming enough protein challenging, however, then adding a protein powder to your diet might be a good idea.

Protein powder can be mixed with just milk or water to make a protein shake.

It can also be added to oatmeal, yogurt, and other recipes, making it a convenient, versatile protein source.

How Much Protein Should I Eat On Mounjaro?

There is no specific protein intake requirement for patients taking Mounjaro.

But ensuring adequate protein intake, typically around 1.2 to 1.6 grams per kilogram of body weight per day, might be recommended to help preserve muscle mass (Obesity (Silver Spring), 2025).

Note that for many individuals, 1.2 to 1.6 g/kg/day can easily amount to well over 100 grams of protein.

And as you can see below, even if you eat protein with every meal, you might not meet your protein needs.

• Breakfast: 2 eggs – 12 gram protein
• Lunch: 4 ounces chicken breast – 32 grams protein
• Snack: ¼ cup almonds – 7 grams protein
• Dinner: 4 ounces salmon – 23 grams protein
• Total: 74 grams protein

Remember that your ideal protein intake depends on your body weight, activity level, etc.

For personalized recommendations, consult a registered dietitian or other healthcare professional.

What Is the Best Protein Powder for Mounjaro?

Not all protein powders are created equal.

Unfortunately, many contain ingredients known to cause painful digestive issues and possibly even gut health problems that might make weight loss harder.

Among these ingredients are food additives, dairy-based proteins, and protein concentrates and isolates.

🚫 Avoid Food Additives

Emulsifiers, thickeners, and other ultra-processed additives can upset your stomach.

This matters because GLP-1 RAs are already associated with digestive side effects, including nausea, vomiting, and diarrhea, particularly during dose escalation (TOS, 2025).

Additives might also alter the composition and function of your gut microbiome – the community of bacteria and other microorganisms living in your digestive tract (North Clin Istanb, 2020). 

One study on the effects of antibiotics and gut microbiome reveals that gut dysbiosis could impair weight loss through several interconnected mechanisms, including enhanced caloric extraction from food and disrupted appetite signaling (Clin Endocrinol, 2017).

It is important to note that although preliminary research linking gut dysbiosis to impaired weight loss is compelling, there is no established causal relationship.

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

You therefore might 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 might 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 might be more gut-friendly.

Order Samples to see for yourself.

Sources

1. Nutrients (Nutrients). Are Dietary Proteins the Key to Successful Body Weight Management? A Systematic Review and Meta-Analysis of Studies Assessing Body Weight Outcomes after Interventions with Increased Dietary Protein. 2021.
2. European Review for Medical and Pharmacological Sciences (Eur Rev Med Pharmacol Sci). Clinical effectiveness of semaglutide on weight loss, body composition, and muscle strength in Chinese adults. 2023.
3. Obesity (Silver Spring, Md.) (Obesity (Silver Spring)). Nutritional priorities to support GLP-1 therapy for obesity: A joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. 2025.
4. The Obesity Society (TOS). Clinical Management of Obesity – Third Edition. 2025.
5. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2020.
6. Clinical Endocrinology (Clin Endocrinol). Antibiotics, gut microbiome and obesity. 2017.
7. Advances in Nutrition | Journal (Adv Nutr). Systematic Review of the Gastrointestinal Effects of A1 Compared with A2 β-Casein. 2017.
8. 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.
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.