I take between 1 – 4000 iu daily, depending on the season. I just get the most reasonably priced bottle on amazon. You are supposed to take it along with vit k to help absorption. I know when I’m getting low as I get bumps under my skin on the backs of my arms which go away when I increase my intake.
I’ve also taken alpha lipoic acid 600mg and high strength vitamin b (cyanocobalamin) after my last relapse to see if it would help nerve repair. I’m thinking about taking ALCAR as well but I’m still reading up on it. There are lots of supplements with astonishing claims but I try to be sensible and take within guidelines and read up on side effects.