Your body is already reliant on vitamins. If you don’t get enough of them, you get sick. It’s even in the name, “vital amines” (nevermind that not all of them are actually amines; naming conventions were established during the early years of research, before they were fully understood). Your body will excrete excess water-soluble vitamins, but you can get sick if you get too high doses of the fat-soluble ones.
Fun fact: polar bear liver is toxic to humans because it has too much vitamin A.
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