FCC unit

FCC unit
   a U.S. measure of purity and effectiveness for chemical substances added to foods. FCC stands for Food Chemical Codex, a code of standards prepared by the U.S. Institute of Medicine for the U.S. Food and Drug Administration. Perhaps most familiar to consumers is the FCC unit for the enzyme lactase, taken by those who are lactose intolerant. There is no definite conversion between FCC units and milligrams, because different manufacturers prepare their products in different ways. Instead, FCC units provide a way to judge the relative effectiveness of different preparations, no matter what their weights.

Dictionary of units of measurement. 2015.

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