SURE, BARNETT (1891–1960), U.S. biochemist, born in Vilkomir (Ukmerge), Lithuania. Sure went to the U.S. in 1908. He became professor and head of agricultural chemistry department, University of Arkansas in 1927. Sure was an independent discoverer of vitamin E and of a new member of the vitamin B complex. He wrote The Vitamins in Health and Disease (1933) and Little Things in Life: The Vitamins, Hormones and Other Minute Essentials for Health (1937).