One simple difference with Vitamin C (Ascorbic Acid):
With natural sources of Ascorbic Acid (e.g. fruit) the Vitamin C is found alongside Flavonoids (e.g. Quercetin), which have a beneficial synergy with Vitamin C and improve it’s antioxidant effects.
Flavonoids were determined to not be “essential” and hence they couldn’t be classified as a vitamin (See Vitamin P).
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