Know what a Vitamin is? They are good for you right? But why?
A vitamin is something that is required for your body to continue to live, but that it can not synthesize on it's own from the carbs, fats, proteins, and minerals it takes in. You have to ingest vitamins one way or another.
You've probably heard the term for a British sailor "limy." Folk lore has it that sailors used to often get Scurvy on long sea voyages. Many guesses at the cause were made, but at some point someone learned that citrus fruits cured Scurvy. (In reality, a lack of vitamin C causes Scurvy, and citrus fruits have plenty of it). So, from that point forward British vessels were stocked with limes. And British sailors smelled of them, so they were called "Limy."