Protein Purity Reference Chart

The chart below contains protein powder purity percentages along with leucine and lactose values for many popular brands sorted in alphabetical order. Click top headers to re-sort listings by protein purity, leucine, or lactose levels.

Brand / Product Flavor Protein Purity Leucine (g/20g) Lactose (mg) Info
Ascent Whey Protein Flavorless 83.30% 2080 1500-2499 +
Gruppo RAW Whey Protein Isolate Flavorless 93.50% 2860 56 +
ISOPURE Unflavored Protein Flavorless 86.20% 2240 0 +
Klean Athlete Klean Isolate Flavorless 89.70% 2075 500-1499 +
Levels Whey Protein Flavorless 78.10% 2080 2000 +
Momentus Essential Grass-Fed Whey Protein Flavorless 85.80% 2480 >500 +
Naked Whey Grass-Fed Isolate Flavorless 92.60% 3050 100 +
Now Sports Whey Protein Isolate Flavorless 85.70% 2079 500-1499 +
Nutricost Whey Protein Isolate Powder Flavorless 85.70% * 500-1499 +
PE Science Select Protein Powder Flavorless 78.00% * 1500-2499 +
Polar Joe Blanco Whey Protein Isolate Flavorless 93.50% 2860 56 +
Transparent Lab Grass-Fed Whey Protein Isolate Flavorless 84.10% * 500-1499 +
Wicked Protein Flavorless 85.20% 2074 <21.4 +

Protein purity percentage calculation data, as well as leucine and lactose values are taken directly from publicly-available, manufacturer-provided sources. * indicates that no value is readily disclosed or available. Color coding for relative reference only. Dark green indicates a value in the top 10% of tabular purity data rankings; light green, a value in the top 30%; yellow, a value between 20% and 50%; and red, a value in the bottom 20% of tabular purity data from select protein brands. See * below for further info.

DISCLAIMER: ProteinPerDay.com and site sponsor are, in no way, affiliated with any of the above companies or products. All trademarks, service marks and company names are the property of their respective owners. We make no claim to efficacy of products listed above per individual athlete. Indeed, many of the products listed above are high-quality and exceptional in their own regard. We have made every effort to present the comparison in a clear, transparent, and objective manner based on information directly advertised or offered by the product manufacturers. *Data as of 03/05/2025; values may have changed since last update. Please confirm with manufacturer(s) before use or purchase choices.