Try different brand: Niacin may cause temporary flushing, but most multivits contain niacineamide, which does not. Presuming yours don't have Niacin this sounds like an allergic reaction. You can't be allergic to pure vitamins but can be sensitive to the many fillers, binders, artificial colors ; preservatives that inferior brands contain, or soy/other food allergens they may contain. Try a brand without additives.
Answered 2/22/2015
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