Explanation
McCollum discovered Vitamin D. ... Elmer McCollum ForMemRS Known for Discovering in 1913. Vitamin A, Vitamin B, and Vitamin D Elmer McCollum was an American biochemist while Danish biochemist Carl Peter Henrik Dam discovered vitamin K. Vitamin E was discovered by Evans and Bishop in 1922 In 1920-1940 discovered vitamin D(3) became classified as a vitamin rather than as a steroid hormone ND16-8-2023
