Best Whey Protein Without Heavy Metals
The best whey protein without heavy metals is one an outside lab has tested batch by batch, not one that only says "tested" on the tub. Of the whey powders we have vetted, Legion Whey+ is our top pick, and three others clear the same bar.
This page narrows our full list of protein powders tested for lead and heavy metals down to whey only, since that is what most of you are searching for.
What the testing evidence says
The Clean Label Project tested 134 popular protein powders and found that 70% contained measurable lead, with some above California's Prop 65 safe harbor limit. Its 2024-25 protein powder study found close to half of the top-selling powders it tested exceeded its heavy metal thresholds.
Neither result is specific to whey. What they show is that a label claim tells you little, and a named certification or a published certificate of analysis (COA) tells you a lot.
For whey, that is the filter we used. We looked for a certification from an outside lab, a short ingredient list, and a brand that says what it tests for. We did not find published third-party results for every whey on the market, and we do not rank the ones we could not check.
The whey picks, ranked
- Best overall: Legion Whey+ Protein. Grass-fed whey isolate from Irish dairy, Informed Sport certified, with heavy metal and banned-substance testing on every batch.
- Best for published lab results: Momentous Essential Grass-Fed Whey Protein Isolate. Two ingredients, NSF Certified for Sport, and a certificate of analysis for every batch through Light Labs.
- Best two-ingredient option: Klean Athlete Klean Isolate. Whey protein isolate and sunflower lecithin only, NSF Certified for Sport.
- Best single-ingredient whey: NAKED 100% Grass-Fed Whey Protein Powder. One ingredient, NSF Certified, and a concentrate rather than an isolate, so it carries more lactose than the isolates above.
If you avoid dairy
- Best plant-based: NAKED Pea Protein Powder. One ingredient, NSF Contents Certified. Plant proteins draw minerals from soil, so the outside certification matters more here than on whey.
- Best dairy-free single ingredient: Equip Foods Prime Protein. Grass-fed beef protein isolate and nothing else.
Comparison
| Product | Form | Independent testing | Ingredients |
|---|---|---|---|
| Legion Whey+ | Whey isolate | Informed Sport | Whey isolate, stevia, natural flavors |
| Momentous Essential Whey Isolate | Whey isolate | NSF Certified for Sport | Whey isolate, ProHydrolase |
| Klean Isolate | Whey isolate | NSF Certified for Sport | Whey isolate, sunflower lecithin |
| NAKED Grass-Fed Whey | Whey concentrate | NSF Certified | Whey concentrate |
Isolate or concentrate?
Three of the four whey picks are isolates. Isolates are filtered further, which cuts lactose and fat per serving compared with a concentrate. That is a taste and digestion difference, and it is not a contaminant claim: we found no published test that ranks isolate above concentrate for heavy metals, so we did not rank on it.
NAKED's whey is a concentrate. It earns its place because it has one ingredient and an NSF Certified mark, which is outside verification of label accuracy and a screen for heavy metals and pesticides. If lactose is a problem for you, pick one of the isolates.
What this means for a buyer
If you drink whey daily, the certificate is the part worth checking, because it covers the batch in your tub. A brand that names its lab and posts results gives you something to verify. A brand that only says "tested" gives you nothing to check.
What the label cannot tell you
Naked's whey and pea powders both carry a California Prop 65 warning for trace lead. That is standard for nearly any plant or animal protein sold in the state, and it is not evidence of a problem specific to Naked. It is also a reminder that "certified" does not mean "zero."
Chocolate and other flavored versions add ingredients that these listings do not cover. Everything above refers to the unflavored versions unless stated. If you buy a flavored tub, check that the certification covers that flavor.
How to check any whey yourself
- Look for Informed Sport or NSF on the tub, then confirm it on the certifier's own site.
- Find the brand's COA page and look for the lead figure for your lot.
- If the brand publishes neither, treat the "tested" claim as unverified.
For how Naked, Levels, Truvani, and Transparent Labs compare on what they publish, see Do Naked, Levels, Truvani, and Transparent Labs protein powders have heavy metals?
Bottom line
Pick a whey with a named outside certification and a short label, and check the certificate for the exact tub you buy. Everything else we have vetted in the category is on our supplements recommendations page.