I don't know. I've had a few allergic reactions over the years, but they've never been consistent. For example, when I was a kid, I got hives (it's always hives) from what my parents thought were fig newtons. I've eaten them since with no problems. Another time, my parents thought I had a reaction to a particular laundry detergent. Again, no problems since. In college I had some sort of reaction to something. My whole body was covered in hives.