It is not possible to answer this question without knowing patient, exam, labs, and meds. He should be seen by his physician and be evaluated; this would include good history, physical exa , review of labs, and meds. I am not a believer in supplements except as replacement for deficiencies. If he is on metformin, checking b12 is important; I use vitamin d to be sure bones are strong in diabetics. If nutrition is a problem, Glucerna may be helpful. Only your physician can answer these questions.
Marvin A. Leder, MD, FACP, FACE