I have recently bought 'MET-Rx PURE CREATINE POWDER' to help me improve my endurance and muscle, and to my surprise it said, 'Not intended for use by persons under the age of 18.' I am 16, turning 17 in 3 days and I am taking 'MAXIMUSCLE HIGH PROTEIN PROMAX EXTREME' which is a protein powder, containing creatine. I have had no adverse effects from 2weeks of taking the 'MAXIMUSCLE' and was wondering what harm could be caused by taking the 'PURE CREATINE POWDER'?