Scientific protein powder rankings

Clean Proteins Ranked

Clean Label Project tested protein powders for lead, cadmium, arsenic, and mercury. Consumer Reports adds product-specific caution context. We rank the exact products by purity evidence, formula risk, transparency, and whether a daily buyer can verify the claim quickly.

Top 3 cleanest protein powders

Recommended protein

Puori PW1 Grass-Fed Whey Protein, Bourbon Vanilla

Clean Sixteen tie · whey concentrate · strongest public transparencyCleanest tested whey — non-detect on all four heavy metals.

View product Evidence page

Recommended protein

Wellbeing Nutrition Whey Protein Isolate

Clean Sixteen tie · unflavoured whey isolateTop-tier isolate — clean metals, low additive footprint.

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Recommended protein

ISOPURE Unflavored Protein

Clean Sixteen tie · unflavored whey isolate · mainstream availabilityMainstream unflavored isolate with clean CLP numbers and easy product verification.

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3 protein powders to avoid as a daily default

Naked Vegan Mass Vanilla 8LB tub from the live Naked Nutrition product page

Caution protein

Naked Nutrition Vegan Mass Gainer — Vanilla

CR 2025: 7.70 mcg lead/serving · plant mass gainerHighest-lead product in the CR 2025 protein-powder test — not a daily protocol pick.

Evidence page

Caution protein

Huel Black Edition — Chocolate

CR 2025: 6.31 mcg lead + 9.21 mcg cadmium/servingThe strongest current caution for users treating protein powder like a daily meal replacement.

Evidence page

Caution protein

Garden of Life Sport Organic Plant-Based Protein — Vanilla

CR 2025: 2.76 mcg lead/serving · 1.93 mcg cadmiumA certification can coexist with meaningful heavy-metal caution.

Evidence page