Yea Blonde's right. You won't notice much if you don't change your diet. You don't have to take supplements; but they work as an easy, convienent, and cheap way to consume protein. Protein's expensive, and its hard to always have the appetite to eat as much as you should; protein shakes are great because they're cheap (think $$ per gram of protein) and they're not that filling.
-UB
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