This is a wonderful tool to help those of us who react to sulfites and histamines in red wine. I was skeptical, but I've been using it for about 3 weeks now, and no headache or flushing from the wine. Yay, I had really been missing it, since my reaction to it had grown stronger with aging and could no longer be ignored. I highly recommend it, as it is easy to use, doesn't affect the taste, and the only drawback is cost -just under $3 a glass if you buy in bulk. And Walmart had the best prices I've seen for it anywhere!