I'd go with sticking to hypotheticals with an understood disclaimer that nothing here should ever be regarded as medical advice - linking to and extrapolating from existing safety information seems reasonable but possibly off-topic in some cases. Getting specific and individual about personal dos...
that is the part where the medical reasoning comes from.
And, rather than adding a 'migrate to Health.SE' option, a "if your question is medical in nature you might consider asking it on Health.SE" bit in the close text might be feasible?
Somebody, I think it was @Martin-マーチン explained well why migration paths should be rarely used... only really good questions that are completely off topic are suitable for migration. If a question won't be kept open on the destination site, it's not a good candidate for migration.
When users vote or flag to close a question that should be migrated to another site on the network, they usually can only choose to migrate to meta:
Occasionally we get requests to add a new migration path, which can only be done by employees. Typically we reject such requests because migratio...
According to an answer to this question, now that Chemistry.SE is out of beta, it is eligible to have migration paths to other sites. I think paths to Physics.SE and Biology.SE would be very helpful now that this is possible.
Is this already in the works or is there somewhere we have to go to ask?