 [ Symptoms ] can weight gain supplements be harmful to teenage boys my son is 16 & started lifting last year he wants to buy weight gain supplements & claims they are all natural i am against this because he is not done with growing & do not feel it will be safe in long run please give advice ty [ Disease ] i am not a big fan of them either not only do that not work the extra protein load has the potential of harming the kidneys i think you are wise to discourage their use