A multivitamin is a preparation intened to supplement a human diet with vitamins, dietary minerals and other nutritional elements. Such preparations are available in the form of tablets, capsules, pastilles, powders, liquids and injectable formulations. Other than injectable formulations, which are only available and administered under medical supervision, multivitamins are recognised by the Codex Alimentarius Commission (the United Nations' highest authority on food standards) as a category of food.