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Vitamin D3 - what strength?

Hi all, I understand vitamin D is generally thought to be a good thing for MS sufferers. I have fairly benign (so far!) RRMS, and would like to keep it that way. Any idea what strength Vit D is best? I see the Highest Potency available is 5000iu, but don't want to overdo it. Are there are side effects to OD'ing on Vit D3?! Any thoughts greatly appreciated.