by Michael Fitzgibbons
Industrial Hygienist
Protein powders offer convenience and serve as a quick way to hit nutrition goals. However, recent investigations have raised a troubling question: What else lies within a scoop of protein powder?
In particular, heavy-metal contamination — especially with Lead (Pb) — has been found in many protein powder products. In this blog post, we will explore:
- How lead gets into protein powders;
- What recent testing reveals about its levels; and
- The potential health risks
Why Lead Appears in Protein Powders
Lead is a naturally occurring metal found in soil and water. Plants, especially, can absorb lead from contaminated soil, irrigation or air. As such, plant-based protein powders (e.g., from peas, rice and hemp) are more vulnerable because the raw materials grow in soil, so contamination can carry all the way through to the finished product.
Processing, blending and the manufacturing environment can also contribute. For example, when powders concentrate many ingredients, any trace contaminants can become more impactful. Worthy of note, even products derived from animal sources (whey, beef, etc.) are not guaranteed free from contamination, though they tend to show lower levels in many studies.
Why This is Especially Relevant in Supplements
Dietary supplements (including most protein powders) are regulated differently (or less strictly in certain respects) than conventional foods. The U.S. Food & Drug Administration (FDA) does monitor them, but does not necessarily pre-approve every supplement product before it hits shelves. Because powders are often consumed daily by fitness-minded people, even low-level contamination can become significant over time. People often assume “natural,” “plant-based,” or “organic” means “cleaner”—but some data show that is not necessarily the case for heavy metal risk.
What Recent Testing Reveals
A report by the nonprofit Clean Label Project tested 160 protein-powder products (70+ brands) and found that 47% of them exceeded at least one Federal or State safety threshold (including for lead). According to that study: plant-based powders had on average three times more lead than whey-based counterparts.
More recently, a 2025 investigation by Consumer Reports tested twenty-three popular powders/shakes and found that more than two-thirds contained more lead in a single serving than what their experts considered safe (based on California’s Prop 65 benchmark of 0.5 micrograms per day).
Plants with chocolate flavoring and organic status in some cases had higher levels of contamination than expected; for example, the Clean Label Project found chocolate-flavored powders had up to 4× more lead than vanilla versions.
Interpretation and Caveats
It is important to note that exposure does not immediately mean damage, and that cumulative exposure is the concern with lead.
The risk thresholds used in these studies vary. For example, Consumer Reports used California’s Prop 65 threshold (0.5 µg/day) which is stricter than some other guidelines. Some industry groups argue that the reporting may be misleading or overly conservative, because serving sizes vary, thresholds differ and not all products were tested in the same way.
For many products, according to modelling (for example, the human health risk assessment in the 2023 study), the estimated adult blood-lead levels from protein powder intake alone were below reference thresholds. That said: “below threshold” does not mean “no risk,” especially for vulnerable populations (children, pregnant people).
Why This Matters: Health Implications
Lead Exposure – What We Know
When absorbed by the body, lead is a systemic neurotoxin affecting virtually every organ system, primarily the central nervous system. In children, even low levels of exposure are linked to cognitive impairment, developmental delays and behavioral issues. In adults, potential effects include high blood pressure, kidney issues, reproductive problems, immune system disruption and cognitive decline. According to the CDC and the World Health Organization (WHO), no level of lead exposure is considered truly safe, especially for children.
How We Can Help
The recent data show that lead contamination in protein powders is a legitimate concern, particularly for plant‐based supplements, and particularly when consumed frequently. While not every product is dangerous and occasional use may not present acute harm for healthy adults, the key issues are cumulative exposure, vulnerability of certain populations, and lack of consistent regulation. Should you have lead concerns please contact Michael Fitzgibbons at (931) 217-4444 or mfitzgibbons@ei1.com.