Protein Supplement Brands

Gold Standard 100% Whey — 24g protein, 120 cal. Informed Choice certified. The category benchmark for 30 years.

ISO100 Hydrolyzed Whey Isolate — 25g protein, 13+ flavors including Fruity Pebbles and Cinnamon Cereal. Informed Sport certified.

Grass-Fed Whey Isolate — 28g protein, no artificial sweeteners or additives. Informed Choice + Informed Protein certified.

Select Protein — whey + casein blend, 24g protein, dessert-accurate flavors. Works for shakes and baking. Third-party tested.

Prime Protein — grass-fed beef isolate, 0g added sugar, no artificial sweeteners. Dairy-free, whey-free, keto-compatible.

30g protein, 160 calories, 1g sugar per shake. NSF Contents Tested. Available at Costco, Walmart, Target, and CVS.

Zero Carb Whey Isolate — 25g protein, 100 cal, 0g carbs, 0g lactose. Informed Choice certified. Also: Infusions clear protein.

Sport Organic Protein — 30g plant protein, NSF Certified for Sport, USDA Organic, certified vegan. Stevia-sweetened only.

Impact Whey — lowest cost-per-gram in the certified category, 50+ flavors. Informed Sport certified. Ships to the US.

Pro Series RTD — 40g protein, 230 cal. NSF Certified for Sport on select products. Maximum protein per RTD serving.

Multi-Purpose Mix — 23g protein, 1g net carbs, works for shakes and baking. Also: Quest Bars, 20g protein at 190–200 cal.

AMP Wheybolic — 40g protein, NSF Certified for Sport. The easiest way to buy certified protein same-day from a physical store.

Pure Whey Protein — Informed Sport certified, approx. £0.40–0.65/serving. Best-value certified whey in the UK market.

Built Puff — 15–17g protein, soft marshmallow texture, 14+ dessert flavors. Plus Sour Puff: sour-candy flavors at protein-bar macros.