My son is 15 years old and has always been thin. He is now on Concerta 54mg. He has not lost any weight since he started the medication. He wants to "bulk up". I am very concerned about allowing him to use any type of supplement because of side-effects. I positively do not want him to take any type of steriod. Is there any natural weight gain supplement that he can take, in conjunction with working out and a solid diet, to gain weight and not jeopardize his use of Concerta or his overall health?