T1D and living in Norway

My grandson will be going to grad school in Tromso, Norway. He was diagnosed with T1D at age 18. He’s now 24.
I’m curious to hear from anyone who:

  1. lives in Tromso or that far north
  2. has information about supplements – especially fish oil, Vit D 3 and B vitamins that will help is stay well during the dark season.
  3. knows about medical resources at the University of the Arctic
    thanks very much