Vitamin A is a fat-soluble vitamin that was not invented but rather discovered and identified. The discovery of vitamin A is attributed to two scientists, Elmer McCollum and Marguerite Davis. They conducted research in the early 20th century and were the first to identify and describe vitamin A as a necessary nutrient for health. They referred to it as the "fat-soluble factor" in their initial work before it became known as vitamin A.
Their research led to an understanding of the importance of vitamin A in maintaining vision, supporting the immune system, and promoting overall health. Vitamin A is essential for various bodily functions and is naturally found in foods like liver, eggs, and dairy products, as well as in the form of provitamin A carotenoids in fruits and vegetables.