Lemons are thought to have originated at the base of the Himalayan Mountains, as a natural cross between the lime and the citron. Cultivation spread throughout the Middle East, Europe, and Africa, and, like many other plant-derived foods, were introduced to the Americas when Columbus made his second voyage in 1493.
It's probably no surprise that lemons provide a lot of vitamin C, but the amount per serving is pretty impressive at 187% of the daily value, making it a super infection fighter. Teamed with flavonoid glycosides called esperetin and naringenin (found in most citrus fruits), the combination provides radical free-radical zapping activity. Free radicals can do serious damage to blood vessels and can contribute to cholesterol build up in artery walls, atherosclerosis, and even heart disease.