The invention relates to a whey protein product having a ratio of whey protein to casein in the range from about 25:75 to about less than 50:50, a total protein content of at least 20% on dry matter basis, and a protein content of about 2.5 to about 8% by weight, based on the weight of the product. The product has a favourable amino acid composition and is especially suitable for athletes. The invention also relates to a method for producing a whey protein product, using microfiltration and ultrafiltration. The whey protein product is composed of the ultrafiltration re- tentate and a casein-containing material at a ratio of whey protein to casein of about 20:80 to about less than 50:50 and a total protein content of at least about 20% on dry matter basis.