Well I have decided to stay natural (because I am only 19) and will be buying supps instead of roids with the money I saved. I have been lifting for 3-4 years hardcore, and have found it difficult to get significant gains anymore. I was thinking of getting creatine, biotin, tribulus, vanadyl sulfate, r-ala, and no2. Think this is a good combo of supplements? What brands do you think are the best for each of these, no2 in specific?