Have to ask your doctor. They’ll check your levels and other factors to properly advise you
I take 2,000 iu per day , in a flare I double it.
Talk to your doctor about the recommended IU for you.
I take vitamin D3 that my neurologist prescribed for me after I had some blood work checked .I also take vitaminE and B12. Your Dr should tell you how much you might need @A MyMSTeam Member
what are your serum lab levels?