Health App

If one was to make an health app that informs the user about certain things that can make them healthier, for the app to be published does the information need to be 100% factual like do they check for things like that? For ex. "Stretching might help you in your 60s" would i have to show where i got this info?

You are gona have a much better time retaining customers for looking legit
then being very very very vague