Vitamins: What are they and what do they do? What do you know? Continue reading to test your knowledge. Vitamins are organic compounds that are needed in small quantities to sustain life. Most vitamins need to come from food. It’s because the human body either does not produce enough of them, or it does not produce any at all.
Furthermore, each organism has different vitamin requirements. For example, humans need to consume vitamin C or ascorbic acid, but dogs do not. Dogs can produce, or synthesize, enough vitamin C for their own needs, but humans cannot.