How to Find the Best Protein Powder for Chemo Patients

📌 Overview and Key Takeaways

This is a Dietitian’s guide on how to find the best protein powder for chemo patients.

Discover how to safely supplement your protein intake during and after chemo.

Last Updated
Jan 25, 2026

Author and Medical Reviewer

Written by Kayla Kamen, MS, RD

Kayla Kamen is a Registered Dietitian with a MS in Nutrition.

Medically reviewed by Jennifer Fossett, PA-C

Jennifer Fossett is a Physician Assistant with a BA in Nutritional Sciences.

Protein Powder for Chemo Patients

Is Protein Powder Good for Chemo Patients?

Studies have found that up to 85% of cancer patients suffer from malnutrition, which can lead to serious consequences if left untreated (Oncotarget, 2017).

Malnutrition in cancer patients is linked to treatment complications, reduced physical abilities, and lower chances of survival.

A protein deficiency is one of the leading causes of chemotherapy side effects and mortality since protein is essential for healing and fighting infections (Nutr Cancer, 2015).

It follows that increasing protein intake can improve tolerance to chemotherapy and its effectiveness.

It also helps to build muscle mass and strength, both of which are associated with better survival rates and outcomes for chemo patients (Nutrients, 2020).

Do chemo patients have elevated protein needs?

Chemotherapy patients have elevated protein needs for several reasons, including:

1. Healing: Chemotherapy can damage healthy cells in addition to cancer cells, leading to increased wear and tear on the body. Extra protein is needed to repair and rebuild these tissues.
2. Immune system support: Extra protein is needed to maintain a healthy immune system, which is weakened by chemotherapy.
3. Muscle mass maintenance: Chemotherapy can lead to muscle wasting (cachexia), especially in patients with advanced cancer. Extra protein is needed to preserve muscle mass and strength, which is important for overall physical function and quality of life.
4. Managing side effects: Chemotherapy often causes side effects like nausea, vomiting, and loss of appetite, which can lead to inadequate nutrient intake and weight loss. Extra protein is needed to prevent malnutrition.

In summary, chemotherapy patients have elevated protein needs to support tissue repair, immune function, muscle mass, and overall recovery.

How Much Protein Do Chemo Patients Need?

Chemo patients should aim to eat 1.2-1.5 grams of protein per kilogram of body weight per day, which is 3-4 times what the average healthy adult needs (J Clin Med, 2019).

Eating this much protein can be challenging, especially for chemo patients with nausea and loss of appetite.

This is where protein powder can help.

Protein powder can be easily mixed with just milk or water, or added to smoothies, oatmeal, and other recipes to fill in gaps in your diet.

That said, not all protein powders are created equal.

What Is the Best Protein Powder for Chemotherapy Patients?

As long as you are eating a balanced diet (getting protein from a variety of sources), the type of protein powder you add to your diet does not matter.

Ingredients do matter, however.

Many protein powders contain ingredients known to cause painful side effects and long-term health problems.

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

🚫 Avoid Food Additives

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

Over time, this can lead to gut dysbiosis, which is harmful for chemotherapy patients as it exacerbates toxicity, increases infection risk, and might even reduce treatment efficacy (Gut, 2019).

Gut dysbiosis has also been linked to the development of various cancers (Curr Oncol Rep, 2014).

⚠️ 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

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/or chemically stripped of everything but the protein.

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

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

Studies show that regularly eating protein concentrates and isolates might disrupt your gut microbiome and cause the formation of toxic byproducts in your gut (Nutrients, 2018; Mol Nutr Food Res, 2024).

You should thus look for protein supplements made from whole food protein sources like egg whites and almonds, which are easier to digest and absorb.

Order Samples to see for yourself.

Editorial Guidelines

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

Sources

1. Oncotarget (Oncotarget). Prevalence of malnutrition in patients at first medical oncology visit: the PreMiO study. 2017.
2. Nutrition and cancer (Nutr Cancer). Low Recent Protein Intake Predicts Cancer-Related Fatigue and Increased Mortality in Patients with Advanced Tumor Disease Undergoing Chemotherapy. 2015.
3. Nutrients (Nutrients). The Impact of Protein Supplementation Targeted at Improving Muscle Mass on Strength in Cancer Patients: A Scoping Review. 2020.
4. Journal of Clinical Medicine (J Clin Med). Nutrition in Cancer Patients. 2019.
5. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2019.
6. Gut (Gut). gut microbiota on the efficacy of immune checkpoint inhibitors in patients with primary or secondary resistance to immune checkpoint inhibitors. 2019.
7. Current Oncology Reports (Curr Oncol Rep). Cancer-Promoting Effects of Microbial Dysbiosis. 2014.
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.