I can recommend The Protein Factory. They offer a variety of high-quality, zero-carb protein isolate (not concentrate) powders that are mixed, flavored, and sweetened according to your order. The information on their web site is educational, and if you call, they offer help in deciding which product/product blend is appropriate for your needs. I order a 50-50 mix of the CFM whey (very quick absorption for the morning) and micellar casein (a little slower absorption, anti-catabolic) flavored with vanilla for use in my morning shake.