In 1930, Paul Karrer elucidated the proper composition for beta-carotene, the main precursor of vitamin A, and discovered other carotenoids. Karrer and Norman Haworth verified Albert Szent-Györgyi's discovery of ascorbic acid and made significant contributions for the chemistry of flavins, which led to the identification of lactoflavin. Deficiency: This will https://ufabetal.online/