Ascorbic acid and Vitamin C are not equivalent--Vitamin C is a form of ascorbic acid (I'm believing what I'm reading). Ascorbic acid is more general, so if anything, Vitamin C should redirect into ascorbic acid.
However, I think it's best if they're separate entries; ascorbic acid about the general class of ascorbic acid, Vitamin C about the L-idoslkwhater of ascorbic acid.
--TheCunctator
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