[aMorePerfectUnion]

Your doctor assumes that the only kind of evidence is a "double blind research study," which of course it is not.

To help though, here's a link...

Research on Vitamin C

[freedumb2003]

>>Your doctor assumes that the only kind of evidence is a “double blind research study,” which of course it is not.<<

Well, we talked about more than that single approach (although it is the gold standard).

Your link basically boils down to: Not demonstrably helpful, but not harmful either.