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TC said: "Manufacturers are going to be more and more reluctant to work with
us if we continue to berate them and threaten them."

I've noticed something that might be helpful to others. If I call a
manufacturer and say "I'd like to know if there's any gluten or wheat in your
product," they immediately become defensive. On the other hand, if I start by
saying "I have dietary restrictions and I'd like to know if it's safe for me
to eat your product," they are usually eager to help.

Mara in MA, USA