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Whey protein supplements, compared

10 products we’ve reviewed list whey protein as a key ingredient. Here’s what it does, what the research uses — and how much each product actually contains.

What it is

The fast-digesting protein fraction of milk. Isolate is filtered to more protein and less lactose and fat than concentrate.

What the research uses

Sports nutrition guidance for active people is 1.2–2.0 g of protein per kg of body weight a day from food and supplements combined.

Whey is a milk protein — not suitable for people with a milk allergy.

Educational information, not medical advice. Talk to a healthcare professional before starting a supplement, especially if you are pregnant, nursing or take medication.

Every product, dose by dose

ProductWhey protein per servingFormScore
100% Grass-Fed Whey Protein Isolate
Transparent Labs100% Grass-Fed Whey Protein Isolate
NSF Certified for SportInformed Choice
28 g proteinGrass-fed whey protein isolatePowder8.8
Gold Standard 100% Whey
Optimum NutritionGold Standard 100% Whey
Informed Choice
24 g proteinProtein blend (whey protein isolate, whey protein concentrate, hydrolyzed whey protein)Powder8.7
ISO100 Hydrolyzed Whey Protein Isolate
DymatizeISO100 Hydrolyzed Whey Protein Isolate
Informed Choice
25 g proteinHydrolyzed whey protein isolate and whey protein isolatePowder8.7
Whey+ Grass-Fed Whey Protein Isolate
LegionWhey+ Grass-Fed Whey Protein Isolate
NSF Contents CertifiedThird-party testedNon-GMO Project Verified
21-23 g protein (varies by flavor)Truly Grass Fed whey protein isolatePowder8.3
Clear Whey Isolate
MyproteinClear Whey Isolate
Informed Choice
20 g proteinHydrolyzed whey proteinPowder8.0
Grass-Fed Whey Protein Isolate
MomentousGrass-Fed Whey Protein Isolate
NSF Certified for Sport
23.3 g (20 g protein)Grass-fed whey protein isolatePowder7.9
Naked Whey Grass-Fed Whey Protein (Unflavored)
Naked NutritionNaked Whey Grass-Fed Whey Protein (Unflavored)		25 g proteinGrass-fed whey protein concentratePowder7.9
Whey Protein
GHOSTWhey Protein
cGMP facility
25 g proteinWhey protein blend (whey protein isolate, whey protein concentrate, hydrolyzed whey protein isolate)Powder7.8
Zero Carb Whey Protein Isolate
IsopureZero Carb Whey Protein Isolate
cGMP facility
25 g proteinWhey protein isolatePowder7.8
Organic Nutrition Shake
OrgainOrganic Nutrition Shake
USDA OrganicKosher
16 g proteinOrgain Organic Protein Blend (grass-fed organic milk protein concentrate, organic whey protein concentrate)Ready to drink7.1

Amounts are per serving as printed on each label. “Not disclosed” usually means the ingredient sits inside a proprietary blend.

Questions people ask

How much whey protein do studies use?
Sports nutrition guidance for active people is 1.2–2.0 g of protein per kg of body weight a day from food and supplements combined.
Which whey protein supplement scores highest?
In our reviews, Transparent Labs 100% Grass-Fed Whey Protein Isolate scores highest at 8.8/10, followed by Optimum Nutrition Gold Standard 100% Whey (8.7) and Dymatize ISO100 Hydrolyzed Whey Protein Isolate (8.7). Scores weigh efficacy, quality, value, experience and transparency — not just the dose.
How much whey protein is in these products?
It varies by product and serving size — for example Transparent Labs 100% Grass-Fed Whey Protein Isolate (28 g protein), Optimum Nutrition Gold Standard 100% Whey (24 g protein), Dymatize ISO100 Hydrolyzed Whey Protein Isolate (25 g protein). The table above lists the amount per serving for every product we've reviewed.

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