How to Find a Protein Powder Without Heavy Metals

📌 Overview and Key Takeaways

This is a Dietitian’s guide on how to find the best protein powder without heavy metals.

Learn about the risks of heavy metals in protein powder.

Last Updated
Jan 16, 2026

Author and Medical Reviewer

Written by Jack, CNC

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

Protein Powder Without Heavy Metals

Is There Such a Thing as Protein Powder Without Heavy Metals?

Heavy metals are naturally occurring elements with a relatively high density compared to water.

They are all around us – in the ground we walk on, in the water we drink, and in the food we eat.

Trace amounts of some heavy metals are good for us.

We need copper and iron to stay healthy, for example.

Other heavy metals, such as arsenic, cadmium, chromium, lead, and mercury, are toxic.

In fact, they are classified as human carcinogens by the U.S. Environmental Protection Agency and the International Agency for Research on Cancer.

Moreover, in recent years, there has been increasing global public health concern about environmental contamination by heavy metals.

Soils polluted with heavy metals are becoming more and more common due to an increase in geologic and anthropogenic activities.

There has also been increasing concern about the levels of heavy metals found in protein powders, specifically vegan protein powders.

It is thought that heavy metals absorbed by plants are concentrated in unsafe levels in protein powders made from plants.

But is this concern legitimate?

Why Are There Heavy Metals in Protein Powder?

Again, heavy metals are natural constituents of the Earth’s soil, air, and water.

It follows that they are absorbed by all plants; even organically grown, non-GMO crops contain heavy metals.

And when animals drink water or eat plants, heavy metals begin to build up in them too.

Meat, fish, eggs and dairy all contain trace amounts of heavy metals (Foods, 2023).

Just because plants contain heavy metals does not mean that they are not safe to eat, however.

And only certain animals, like tuna, contain enough heavy metals that they should be eaten in moderation.

Most of the time, plants and animals contain heavy metals at levels so low that they do not pose a threat to human health.

And if you eat a balanced diet, even tuna is perfectly safe to eat.

So, if you use protein powder that is made from ingredients grown or raised on planet Earth, you are consuming heavy metals.

There is no way around it there is and no such thing as protein powder without heavy metals.

Do I Need to Worry About Heavy Metals in Protein Powder?

In January 2025, a group called the Clean Label Project published a viral article warning consumers about the dangers of heavy metals in protein powders.

It tested 160 protein powders and found that 47% of them exceeded the California Proposition 65 (Prop 65) safety thresholds for toxic metals.

Prop 65 is a law that requires businesses to warn California residents about exposure to dangerous chemicals.

WARNING: This product can expose you to chemicals including [name of one or more chemicals], which is [are] known to the State of California to cause cancer.

Although it clearly has good intentions, Prop 65 establishes thresholds for significant exposure below those of any other major health organization in the world.

In other words, Prop 65 errs on the side of caution.

For this reason, Prop 65 warning labels are everywhere, from foods and beverages, to furniture, to electronics.

The fact that many protein powders contain levels of heavy metals exceeding Prop 65 thresholds is therefore not surprising, nor necessarily concerning.

To put matters into perspective, according to FDA data, foods like rice, leafy greens, and root vegetables can contain more heavy metals per serving than protein powder.

Moreover, research shows that moderate consumption of protein powder containing heavy metals does not pose risks to human health (Toxicol Rep, 2020).

So, why did the Clean Label Project go out of its way to “warn” you about heavy metals in your protein powder?

It just so happens that the Clean Label Project sells third-party label certifications to protein powder companies.

Companies can pay the Clean Label Project tens thousands of dollars to confirm that their products don’t contain dangerous levels of heavy metals.

It follows that the Clean Label Project wants you to worry about heavy metals in your protein powder so brands feel pressured to pay for their certification.

It’s also a great example of why you should be skeptical of certifications.

Is that stamp of approval really there to protect and inform you, or is it just someone’s way of making money?

I do agree with the Clean Label Project on one point: that you should think critically about the food you eat and do your research.

Although you cannot avoid heavy metals, you can avoid ingredients known to cause painful side effects and even long-term health problems.

🚫 Avoid Food Additives

Regularly eating emulsifiers, thickeners, and other additives, for example, can alter the composition of your gut microbiome (the collection of microorganisms living in your gut) (North Clin Istanb, 2019).

This can lead to gut dysbiosis, or an imbalance in gut bacteria, which contributes to a wide range of chronic diseases, including obesity, type 1 diabetes, and colorectal cancer (Microorganisms, 2022; J Exp Med, 2019).

Because gut microbiome affects various physiological processes, including immune function and inflammation, when the balance of bacteria therein is disrupted, it can have a huge impact on your overall health.

⚠️ 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 an issue for everyone, can cause digestive issues.

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.

This is particularly true for casein protein, which forms a gel-like substance in your stomach that slows down digestion.

🚫 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. Foods (Foods). Heavy Metals in Foods and Beverages: Global Situation, Health Risks and Reduction Methods. 2023.
2. Toxicology Reports (Toxicol Rep). A human health risk assessment of heavy metal ingestion among consumers of protein powder supplements. 2020.
3. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2019.
4. Microorganisms (Microorganisms). Gut Microbiota Dysbiosis: Triggers, Consequences, Diagnostic and Therapeutic Options. 2022.
5. The Journal of Experimental Medicine (J Exp Med). The gut microbiome: Relationships with disease and opportunities for therapy. 2019.
6. Nutrients (Nutrients). Effect of a Protein Supplement on the Gut Microbiota of Endurance Athletes: A Randomized, Controlled, Double-Blind Pilot Study. 2018.
7. 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.

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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.