My Father Is 62 Yrs With High Diabetic 2 As

My father is 62 yrs with high diabetic 2 as well had 2 angioplasty operations in 1.5 yrs?? Problem is his immunity is down n feel weak...even have spondilites ....sir my question is what supplements shall I give him including multivitamin and protein powder n other things to improve his stamina and power....