Whey protein isolate

Whey protein isolate is a concentrated form of whey protein, a by-product of cheese production. It is produced by further processing whey to remove most of the lactose and fat, resulting in a powder that is typically over 90% protein by weight.

Manufacturers add whey protein isolate primarily for its high protein content, which contributes to satiety and muscle growth. It is commonly found in protein powders, bars, and sports nutrition supplements, where it serves as a primary protein source.

Whey protein isolate is not classified as a food additive in the UK and therefore does not have an E-number. It is a source of high-quality protein, which plays a role in muscle repair and growth. Regulatory bodies like EFSA have evaluated proteins, but specific assessments for whey protein isolate in terms of safety limits are not typically detailed in the same way as for additives. Evidence generally supports its role in sports nutrition, but claims about significant health benefits beyond protein provision should be viewed critically.