The roots contain high quantities of alpha- and beta-carotene, and are a good source of vitamin K and vitamin B6. No one knows exactly when the first carrots appeared, because many people mistook them for parsnips, a close relative of the carrot. Carrots are loaded with beta-carotene, a natural chemical that the body changes into vitamin A. The deeper orange the carrot, the more beta-carotene you’re getting. The deeper orange the carrot, the more beta-carotene you’re getting.