Leanest Protein Powders

Ranked purely by protein per 100 calories: the powders that deliver the most protein for the fewest calories per scoop. Collagen powders are excluded because collagen is not a complete protein.

Rankings recompute automatically as new verified products are added. Tap a column to sort; product lines with multiple flavours show their best scoring flavour.

#	Product
1	Isopure Zero Carb6 flavours	25g	100	25g	0g	0g
2	Optimum Nutrition Gold Standard 100% Isolate2 flavours	25g	100	25g	≤1g	0g
3	Nutricost Whey Protein Isolate13 flavoursvaries by flavour	30g	130	23.1g	≤1g	0g
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4	Ascent Native Fuel Whey12 flavoursvaries by flavour	25g	110	22.7g	≤1g	0g
5	Dymatize ISO10014 flavours	25g	110	22.7g	≤1g	0g
6	Isopure Low Carb3 flavours	25g	110	22.7g	0g	≤1g
7	Naked Nutrition Naked Pea5 flavoursvaries by flavour	27g	120	22.5g	2g	0g
8	Optimum Nutrition Gold Standard 100% Casein4 flavours	24g	110	21.8g	2g	0g
9	PEScience Select Protein13 flavoursvaries by flavour	24g	110	21.8g	≤1g	0g
10	Quest Protein Powder6 flavoursvaries by flavour	24g	110	21.8g	≤1g	0g

How this ranking works

Every nutrition value is transcribed from the manufacturer’s published nutrition label and verified by hand, with no third party food databases.
Product lines are ranked, not individual flavours, so one product’s 20 flavours can’t fill the list. Each entry shows its best scoring flavour.
A maximum of two lines per brand keeps the list diverse.
Labels that don’t state sugar or fiber are treated as unknown (never as zero) and are excluded from sugar and fiber rankings.
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Leanest Protein Powders

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