Originally Posted by
pennycandy
I believe you are correct. If you look at the ingredients in egg white protein powders, egg white powder or egg albumin is usually listed as the first ingredient.
Example:Ingredients: Egg albumin, xylitol, natural flavor, xanthan gum, lecithin, stevia.
I don't think the author meant that egg whites don't contain protein but rather egg white powder is different from what is commonly known as protein powder. Protein powder can have the main ingredient as soy, whey, egg white etc but it also has other ingredients and can come in flavors. There are some protein powders that are unflavored a well. Many protein powders contain some form of sweetener. Read the ingredients.
I use an unflavored protein powder when I make some baked goods such as muffins. It tends to add a dryness to the finished good so I add mashed ripe banana for extra moistness.