Given that you also ask about multivitamins, I guess you mean ‘a vitamin D supplement not as part of a multivitamin’, but you might want to say it explicitly.
Whether it’s bundled isn’t that important. On the other hand what’s interesting would be the dose. But that add another question.
I would prefer not counting it.
Whether it’s bundled isn’t that important. On the other hand what’s interesting would be the dose. But that add another question.