How to Find the Best Protein Powder for Depression

📌 Overview and Key Takeaways

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

Discover how protein powder can affect your mental health.

Last Updated
Jan 21, 2026

Author and Medical Reviewer

Written by Jack, Founder

Jack is the Founder of Drink Wholesome.

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

Kayla is a Registered Dietitian with a MS in Nutrition.

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

Protein Powder for Depression

Can Protein Powder Cause Depression?

You may have read that protein powder can cause depression, which is not true.

No clinical evidence that supports an correlation or even association between protein powder consumption and depression.

Almost everyone who claims that there is a link between protein powder consumption and depression cites the same study conducted by the University of Sydney.

In this study, researchers examined the relationship between dietary branched-chain amino acids (BCAAs) and overall health, and found that long-term dietary BCAA manipulation influences health and lifespan in mice.

Note that his study involved mice, not humans.

The notion that protein powder can cause depression in humans is therefore an extrapolation of animal data to humans.

And the assessment of human response from animal data is significantly limited, so using this study to make claims about human health is problematic to say the least.

Moreover, anyone who uses this study to suggest that protein powder causes depression in humans does not understand what BCAAs are.

Branched chain amino acids (BCAAs) are a group of 3 amino acids: valine, leucine, and isoleucine.

They are in most of the foods that we eat, not just in protein powders.

To say that protein powder, because it contains BCAAs, causes depression is therefore silly.

If BCAAs were really the issue, then any dietary protein sources could make us depressed.

Finally, the study in question mentions depression only once, and the researchers were referring to existing literature (J Nutr, 2005), not their own findings

In short, protein powder itself will not make you depressed.

That said, some common protein powder ingredients could affect your mental health.

What Is the Best Protein Powder for Depression?

As long as you are eating a balanced diet, the type (egg, pea, whey, etc.) of protein powder you use does not matter.

Ingredients do matter, however.

Many protein powders contain ingredients that could contribute to mental health problems.

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

🚫 Avoid Food Additives

Regularly eating food additives like emulsifiers, thickeners, and flavorings can alter the composition and function of your gut microbiome (North Clin Istanb, 2019).

This, in turn, can lead to gut dysbiosis (Microorganisms, 2022), which research shows can affect your mental health and contribute to mental disorders such as anxiety and depression.

This is all possible due to a bidirectional pathway between your gut and brain called the gut-brain axis.

⚠️ 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.

Sources

1. The Journal of Nutrition (J Nutr). Branched-chain amino acids and brain function. 2005.
2. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2019.
3. Microorganisms (Microorganisms). Gut Microbiota Dysbiosis: Triggers, Consequences, Diagnostic and Therapeutic Options. 2022.
4. Nutrients (Nutrients). Effect of a Protein Supplement on the Gut Microbiota of Endurance Athletes: A Randomized, Controlled, Double-Blind Pilot Study. 2018.
5. 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 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.