Only organic molecules (and not even all organic molecules) are considered vitamins. Even though salt is essential, it is not created through organic processes (EDIT – not really what ‘organic molecule’ means, but i’m leaving it so as to keep ELI5), and so it is considered a ‘mineral’ rather than a ‘vitamin’. Things like Calcium and Iron also fall in this category.
Another point to keep in mind is that Vitamins are species-specific. For example, we need to eat Vitamin C because we cannot make it ourselves, but Felines CAN make Vitamin C in their own body. So from the perspective of a cat, ‘Vitamin C’ is just another chemical their body makes automatically, rather than being a ‘Vitamin’ that they need to find in the environment.
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