I know this doesn't really help immensely but this is what I've experienced. I've seen some children that cannot even touch a nut or nut shell because they are that allergic. I've been asked the same question (I use only soy) so I researched. I couldn't find any articles on it, even all the testing research. My brother, however, cannot be in the room with a soy candle, even unscented or he gets an allergic reaction. I am highly allergic to ingesting soy but can play with it all day and burn it all day. So all I say now is that I wouldn't take a chance if anyone around is allergic to soy, but soy really isn't a nut.