With the right PCT the side effects should not be that different from those of an adult. With test back in production after cycle functioning at a normal level, i dont see why there would be. As for the question, i would probably think that the teenager would gain more than the adult. Unless you want to take into account the training habits and diet of both parties. IDCBP, i dont know about you, but i havn't seen any teens out there gaining enormous amounts of weight and strength gains as if they were on cycle all the time. If that were true teens would have no use for AAS because their body would already behave and grow like it was on cycle. I agree on the receptor site affinity scenerio, that is the main reason why as you grow on the # of cycles you have taken, you also have to increase dosages to get the same gains.