Does the letter of introduction of health certificate have to be from a food company?

Does the subject want to ask, "Do you have to open a letter of introduction for health certificates to food companies?" ? Want it. When entering a new company, the letter of introduction will improve the admission rate. Letters of introduction from celebrities can be entered directly without an interview, and a health certificate is needed to enter a new company. In order to prove that you are healthy and there will be no accidents, both letters should be sent to a food company to improve the admission rate.