I avoid taking any nutritional supplements unless it is actually prescribed to me by my doctor. Especially when it comes to protein powder. There are studies that show their adverse effects too, especially on our renal health. I take a protein rich balanced diet. I have a moderate work out regime and my protein intake through the balanced diet that I take has been good enough so far. However, there is a big market of protein powder and other protein supplements out there and they have a huge consumer base. It's a profitable business out there.