And, re the matter at hand:  I agree, and RS seems to support, that megavitamin therapy is used by practitioners of orthomolecular medicine, not the other way around.  Unless there's solid RS showing that MVT is generally defined as, or equated with, OM, I don't see any reason to mention it in the introductory sentence or conflate the terms.  I'll certainly concede that it's widely used (as are megamineral, megaamino, mega* therapies) and will gladly stipulate to its inclusion in the opening section, but I can't see my way beyond that.  Any thoughts/suggestions, anyone?