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In page American cuisine:

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From 1912 to the end of the 1930s researchers discovered and popularized the role of various vitamins and minerals in human health. Starting with iodized salt in 1924, commercially distributed food began to be fortified with vitamins and minerals. In 1932, milk began to be fortified with viosterol, a purified vitamin D2 product. Synthetic thiamin (vitamin B1) first became available after 1936 and bakers began voluntarily enriching bread with high-vitamin yeast or synthetic vitamins in the late 1930s.[citation needed]