Whey protein is indeed a source of protein, containing a rich mixture of proteins derived from milk.
whey protein does not contain protein

Protein Powder: The What, Why, & How To Choose - University Health Center
Source: healthcenter.uga.edu
Key Evidence
Sources like Healthline and MedPark Hospital describe whey protein as a premium protein source rich in beneficial amino acids.
healthline.comhealthline.comWhey Protein 101: The Ultimate Beginner's Guide
medparkhospital.commedparkhospital.comWhey protein - Types, Benefits, Why should I take it?
Wikipedia explains whey protein as a mixture of proteins isolated from whey, a dairy by-product.
en.wikipedia.orgen.wikipedia.orgWhey protein
The University Health Center notes whey protein as an animal-based protein powder made from dairy.
healthcenter.uga.eduhealthcenter.uga.eduProtein Powder: The What, Why, & How To Choose
What the Evidence Shows
Whey protein is a well-established protein supplement derived from the liquid by-product of cheese production. It contains multiple types of proteins such as beta-lactalbumin, beta-lactoglobulin, serum albumin, and immunoglobulins. These proteins provide essential amino acids that are quickly absorbed by the body, making whey protein a popular choice for muscle building and dietary supplementation.
Multiple reputable sources confirm that whey protein powders are concentrated forms of protein extracted from milk, designed specifically to increase protein intake efficiently. There is no credible evidence supporting the claim that whey protein does not contain protein; rather, it is defined by its protein content.