In 1930, Paul Karrer elucidated the correct composition for beta-carotene, the principle precursor of vitamin A, and recognized other carotenoids. Karrer and Norman Haworth verified Albert Szent-Györgyi's discovery of ascorbic acid and made considerable contributions into the chemistry of flavins, which led on the identification of lactoflavin. Deficiency: This might https://ufabetal.online/