May 27, 2015 • A vitamin is an organic compound that cannot be made by the human body, but is a required nutrient vital for its various functions. Vitamins are needed in only limited amounts and thus are traditionally derived from our diet. And, yet, nearly half of the U.S. population takes multivitamin supplements—even in times of financial downturn. In 2010 the U.S. supplements industry reached $28 billion in annual sales. And, although no clear scientific need has been defined for vitamin supplementation, the most common reason for taking vitamins is a desire to “improve” or “maintain” overall health, according to a poll conducted by the National Institutes of Health in 2013.