Ive never taken a protein supplement before but Im considering it now, so I went to GNC and saw that they have many different kinds. I want to use the protein to gain more muscle from lifting. I asked the woman that works there and she just said "That one has different Vitamins and stuff". When I asked her what kinds of Aminoacids it has she told me "It doesnt have Aminoacids, just protein". Is it normal that they know nothing?