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Ranked by evidence

Best Protein Supplements

The 10 highest-scoring protein supplements in Formulate's catalog, ranked by the same automated rubric we apply to every product: ingredient dose, bioavailable form, label transparency, safety, and third-party testing. No sponsorships, no pay-to-play.

Scored by the Formulate Research Team · Last reviewed July 2026

  1. 1
    Thorne
    Protein Isolate - Chocolate

    21 grams of bioavailable protein with flavors and sweeteners derived from natural sources Great tasting, high-quality whey protein designed for athletes, aging individuals, and…

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    96A
  2. 2
    Thorne
    Whey Protein Isolate - Vanilla

    21 grams of bioavailable protein with flavors and sweeteners derived from natural sources Great tasting, high-quality whey protein designed for athletes, aging individuals, and…

    Find on Amazon
    96A
  3. 3
    NutraBio
    Clear Whey Protein Isolate Powder

    Strongest on transparency (100/100).

    Find on Amazon
    96A
  4. 4
    NutraBio
    Whey Protein Isolate Powder

    Strongest on transparency (100/100).

    Find on Amazon
    96A
  5. 5
    Transparent Labs
    Grass-Fed Whey Protein Isolate

    Transparent Labs Grass-Fed Whey Protein Isolate — powder format. Contains Grass-Fed Whey Protein Isolate, Calcium, Iron, Protein and 1 more. Supports: Energy, Gut Health, Founda…

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    95A
  6. 6
    Optimum Nutrition
    GOLD STANDARD 100% Casein

    Strengths: All ingredients have Grade A evidence.

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    90A
  7. 7
    Transparent Labs
    Grass-Fed Beef Protein Isolate

    Fuel your fitness with Transparent Labs whey protein isolate. Grass-fed, gluten-free, and naturally sweetened for clean, effective muscle support.

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    89A
  8. 8
    Onnit
    Grass Fed Whey Isolate Protein - Vanilla (30 Serving Tub)

    Strongest on safety/redundancy (100/100).

    Find on Amazon
    89A
  9. 9
    Nutricost
    Whey Protein Concentrate Powder

    Strongest on safety/redundancy (100/100).

    Find on Amazon
    85A-
  10. 10
    Nutricost
    Casein Protein Powder

    Strongest on safety/redundancy (100/100).

    Find on Amazon
    84A-
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Frequently asked questions

What is the best protein supplement?

Thorne Protein Isolate - Chocolate is Formulate's highest-scoring protein supplement at 96/100 (grade A). 21 grams of bioavailable protein with flavors and sweeteners derived from natural sources Great tasting, high-quality whey protein designed for athletes, aging individuals, and…

How does Formulate rank protein supplements?

Each product is scored 0–100 by the same automated rubric. Clinical evidence, dose accuracy and bioavailable form carry the score; manufacturing, label transparency and safety are checked separately and can only cost points. Rankings reflect the formula on the label — not advertising or sponsorships.

How many protein supplements were compared?

This ranking shows the top 10 protein products Formulate has scored. Browse the full catalog for every product and its breakdown.

Best supplements by category

Best MineralsBest MultivitaminsBest Amino AcidsBest AdaptogensBest Fish Oil & OmegasBest BotanicalsBest NootropicsBest B Vitamins

How these are ranked

Every protein product is scored on dose accuracy, ingredient form, certifications, transparency, and third-party testing — the same rubric across the whole catalog. See the methodology page for the full breakdown, or browse every supplement.

Educational only. Rankings reflect product formulation quality, not personalized medical advice. Talk to a qualified healthcare provider before starting a new supplement, especially if you take medication.