Vitamins: Sources, Health Tips app - your go-to source for all things vitamins and natural health! With our app, you'll be able to easily access a wealth of information on vitamins and their sources, as well as health tips to help you optimize your overall wellness. Vitamins are organic substances produced by plants or animals. They often are called "essential" because they are not synthesized in the body (except for vitamin D) and therefore must come from food. Vitamins are divided into two c