Individuals with celiac disease or a sensitivity to gluten should exercise caution when consuming whey protein powder, as some whey protein products may contain trace amounts of gluten. The source of the whey, such as from cows fed with gluten-containing grains, can also result in gluten contamination.
It is important for individuals with celiac disease or gluten sensitivity to look for whey protein powders that are labeled as gluten-free, or to consult with a healthcare professional before adding whey protein to their diet. They may also want to consider using a protein powder made from alternative sources, such as pea or rice protein, which are typically gluten-free.