<<Disclaimer: Verify this information before applying it to your situation.>> 800 numbers for reaching consumer departments of cereal companies: Post cereals: 1-800-431-POST 8 a.m. to 6 p.m. General Mills: 1-800-328-1144 7:30 a.m. to 5:30 p.m. CST Ralston Purina: 1-800-345-5678 9 a.m. to 4 p.m. CST Kellog: 1-800-962-1412 8 a.m. to 8 p.m. EST We use these numbers to call and lobby for them to try and provide more cereals that are GF. Melody in NH