 [ Symptoms ] is hgh beneficial to a youth in stage 5 tanner  could hgh benefit a 16 yr old boy who is stage 5 tanner but has only grown 12 inch since the age of 12 [ Disease ] it is likely too late but your son would need to be carefully examined by a pediatric endocrinologist if he has completed his growth based on bone x rays and other lab tests it would be unlikely that he would grow taller