Do protein powders and sports supplements contain heavy metals and microplastics?
Yes. Many protein supplements contain detectable levels of lead, arsenic, cadmium, and mercury. Microplastics from plastic tubs and scoops add to the contamination.
What's actually in it
Protein powders are made from plant or animal sources like whey, soy, pea, rice, and hemp. These plants and animals absorb heavy metals from soil and water as they grow. Processing concentrates the protein, but doesn't remove the metals.
Rice protein consistently tests highest for arsenic because rice absorbs it from paddy soil. Hemp protein has been found with high cadmium levels. Whey and casein powders can carry lead from the dairy supply chain.
What the research says
A 2026 study analyzing heavy metals and microplastics in sports protein supplements found measurable concentrations of multiple heavy metals across tested products, plus microplastic contamination. The microplastics came from the plastic tubs and scoops used during storage and handling.
Consumer advocacy group Clean Label Project tests thousands of supplements annually and consistently finds concerning heavy metal levels in protein powders, especially plant-based ones. Some single servings contained arsenic levels above safe daily limits for children.
Look for protein powders that publish third-party heavy metal test results. NSF Certified for Sport and Informed Sport certifications require testing that includes heavy metals. Rotating protein sources also helps avoid accumulating one specific metal.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Heavy metal and Microplastic exposure from sports protein supplements: Integrated assessment | Food Chem Toxicol | 2026 |
What to use instead
Browse our vetted, non-toxic alternatives. Every product is third-party certified.
Shop Non-Toxic Home