answer:Might you be allergic to a flavoring ingredient in the oils and vinegars? I would read the labels closely to see if there are added preservatives, too. We have a fancy place nearby with dozens of flavors and my fiancé loves the stuff, and we’ve bought several bottles over the past year. He’s never commented to me about feeling flush, nor have I felt it – and I am allergic to sulfites in wines (which are also used as coloring and preservatives).