You take your vitamins every day like you know you should, but have you ever wondered how this habit got started? About 86% of America adults take vitamin supplements, according to the American Osteopathic Association. Healthy teeth and gums require plenty of nutrients, including calcium, phosphorus and vitamins A, C and D, but it wasn’t always a matter of crunching on Fred Flintstone to get them. Here’s a brief overview of how vitamins went from virtually unknown to a staple of Americans’ medicine cabinets.