@phoenixwren I'd never even thought about the allergen aspect, so thanks for bringing that up. In fact, it lead me intoa nice cozy research dive and I'm very strongly considering writing a post about it. In the mean time, the short answer is that you probably don't have to worry about it, at least relative to your risk from incidental contamination due to processing.
That's good to know; I'd love to read a post about what you found! When I've tried in the past I didn't have much luck.