OK, it sounds like the real wasabi is the best. My question is about S&B brand. It's obviously fake, but what about the xanthan gum in it? Xantan gum has several sources including wheat. I've tried looking on S&B's web site to find out the source of their xanthan gum is. I'm going to avoid using it until I get definitive answers. Any suggestions. Even prepared horseradish has xanthan gum. Anyone know about this ingredient? Thanks.