The thing about standards is they are able to be re-evaluated from time to time. I think it's worth examining what legitimate purpose spreading health misinformation serves, and how that is beneficial to society.
I don't think it's feasible to address individual users.
I think a good place to start is treating the falsification of data in research studies like fraud, potentially with criminal penalties.
Another avenue is requiring social media businesses to make reasonable efforts to flag health misinformation. If Facebook et al are making billions in revenue off false information, they should have a responsibility to combat it, at the risk of penalties.