He will only eat carrots, sweet potato mashed with normal potato, will eat any type of veg when hidden in lasagne, shepherds pie etc but he wouldn't want to have this all the time.
He will also eat satsumas and oranges at a push but he won't drink any orange juice or apple juice etc.
He drinks plenty of organic semi skimmed milk on the plus side.
Will multi vitamin tablets do him any good. As a family we have never bought any health supplements as we have a very good varied diet 80% of the time.