But unlike Minot’s anemia, she found that the anemia in Bombay couldn’t be reversed by Minot’s concoctions or by vitamin B12. Astonishingly, she found she could cure it with Marmite, the dark, yeasty spread then popular among health fanatics in England and Australia. Wills could not determine the key chemical nutrient of Marmite. She called it the Wills factor. Wills factor turned out to be folic acid, or folate, a vitamin-like substance found in fruits and vegetables (and amply in Marmite). When
