“What’s is a good (evidence-based) goal for vitamin D as measured by a blood test?

 “What’s is a good (evidence-based) goal for vitamin D as measured by a blood test? Specifically, if someone is taking a vitamin D supplement and checking vitamin D blood levels regularly, what should the goal be from the standpoint of best longterm health outcomes (as far as we currently know)? Does it depend on certain factors?”

No more than one page.

Use primary resources/research on the long term benefits of vitamin.  at least 2 references not more than 3 years old and cited appropriately in APA