You may unsubscribe at any time. Vitamin A is a single vitamin, but two types are found in food. Preformed vitamin A, which your body can use immediately, is found in animal foods. Provitamin A is ...

Carotenoids, on the other hand, are found in plant-based foods like carrots and sweet potatoes and must be converted into retinoids by the body before they can be used. When choosing a vitamin A ...

Bottom line. Most people don't need B vitamin supplements, but they might make sense for a few groups: Strict vegetarians might need additional B12, which is found in animal-derived foods.