Which one of the lipid-soluble vitamins is not considered to be an essential vitamin in adults?

Question

Quizplus · Accepted Answer

Only vitamin D can be produced by the body and is considered nonessential in the diet.All other water-soluble vitamins (the B vitamins and vitamin C) and lipid-soluble vitamins (vitamin A, vitamin E, and vitamin K) must be derived from the diet.Some consider vitamin D to be an essential vitamin in growing children, because the demand for vitamin D is high during childhood.In adults, when the demand is less, sufficient levels of vitamin D can be produced by the body from the precursor 7-dehydrocholesterol.

Which One of the Lipid-Soluble Vitamins Is Not Considered to Be