Is theobromine in Hershey's chocolate

No.

Yes they do My Girl friends Allergic, As in can Die! And nearly DID! They use a loop hole to list it as a natural Flavoring. The Soy in it is a MSG Chain known as Soy Lecithin. Some people use Soy Lecithin as a emulsifier and even a heath food. Its still a form of MSG (though not technically) but to layman it IS For all practical purposes MSG as if you have problems with the one you will with the other since the nearly identical structure and effects. Only lawyers and chemist teachers and Hershey Allergy Task force would argue the differences.