Soy lecithin?

Is this an ingredient that is known to trigger migraine? I have the Heal Your Headache book and lots of soy stuff is in there like soy protein etc but not this specifically.
Does anyone know?

The only soy I’ve religiously avoided is the fermented stuff: miso and soy sauce.

I haven’t tried bean sprouts or edimame, but I’m not terribly worried about them.

Thanks David! It is in so much stuff I was hoping it wasn’t something I had to avoid. I don’t eat a lot of it but was wondering.