How Would You Contact A Company To Get Data On Their Products?

I want to get food product label information that is on the packaging. If you were to write to a company and ask for data on all their current products who would you contact? A Board Member, some customer service phone number or is there a better person to ask for this info? I do have a USDA database, but I am finding that some of their values don’t match the values on the labels from the store.