A method of imparting high water dispersibility to a protein product or protein-containing material, such as a powdered or particulate protein product, which method includes adding a surfactant and a flow enhancing agent to the protein product. The method is applicable to vegetable protein products, such as soy protein, and is also applicable to non-vegetable protein products, such as casein. Additionally, the method is particularly useful for imparting high water dispersibility to protein products in which greater than about 80 wt. % of the protein therein is water soluble protein.