Precision Nutrition is not certified with any accreditation company, specifically in the United States. They are actually a Canadian company focusing most American consumers.
If you pay $1000 for their certificate, you basically get head knowledge and nothing more. They tell you that you can label yourself as “PN certified” which means nothing to most people or employers. They pay affiliates to talk good about their program all over the internet. Just hype. If you have ever read any of their writing, they are arrogant and like to tell you how great they think they are, and really if you are going to spend money to get certified anywhere, you should just stick with accredited fitness companies like ACE, NASM, ACSM
Don’t fall for the Integrative Nutrition scam. I would go PN before I would IN. They have no science basis for most of their curriculum and they use celebrities like Dr Oz to sucker people into paying for a useless program that you can’t use anywhere.
Best bet is to go with an accredited fitness company certification.