Yes I have, from GNC it was a 3 bottle stack, muscle something.....I forget. It was really expensive at the time but I did feel enormous pumps and got good gains. The night time stuff gave me insomnia though. That was bad.
You need to get on Creatine.
I was at a youth retreat this last weekend and there was this 16 yr. old girl who takes creatine......she gots some fricken definition. We were in the hot tub (easy there, there was a bunch of us) She said "you think you got muscles, look at me" and took a pose. I was blown away. Great shoulder to bi tie ins, she had great definition for only 16. I encouraged her to get into fitness competition.