Question
Do fruits & vegetables require vitamins to grow? If yes, then why and is it enough to be beneficial for a human to absorb?

Answer
Plants are some what similar to humans as they require nutrients to grow but different types. For plants natural nutrients found in high quality compost is excellent but not for humans. The high quality compost that has been fired in a rotary kiln will kill most of the bad things. This compost is a bit expensive and you might try making your own.