Hi, Thanks for writing in. The Animal Pak supplement is a nutritional supplement used to increase nutrition in athletes and young people. It contains high dose of proteins, vitamins and amino acids which are to be taken cautiously in association with workouts. Animal Pak increases the endurance of the body and gives stamina to overcome short term energy needs. It does not have a strong link to causing cancer in those taking it but this is like a medicine and is to be taken in recommended doses. In the long run these might predispose to serious health condition including cancer but confirmed reports are yet to be found in this matter. Please do not worry.