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I took 2 research classes in grad school. It's not just one study. There's pages of lit reviews, cohort studies, and randomized control trials that examine the effects of vitamin C in every academic database.
People in academia related to those pharmacology and biochemistry published those studies, so a lot of them do take it seriously.
And why are you posting a link to an article about Vitamin D when I'm talking about Vitamin C? Is that what they taught you in grad school?
It depends on what you consider the baseline and whether you define maximum as an idealized theoretical maximum or not.
Analogous (but not entirely 1-1) example.
Does pushing weights boost your strength? Does it boost your theoretical maximum strength?