Re: What is a FCC Lactase unit?

David,

This relates to the amount of lactase (the enzyme that helps to break down the sugar lactose) in Lactaid.   Depending on how it's prepared, an 
enzyme can vary in its ability to perform a function.  Therefore, putting in "X" grams of an enzyme doesn't really say how much active 
enzyme is present--some batches are more active than others.  The Lactaid makers have to perform a test to determine how much of a
particular prep of lactase is needed to break down a specified amount of lactose in an hour--this is called a "unit" of an enzyme.
Just as an example (I don't know if these numbers are right)--1 unit of lactase can break down 1 gram of lactose in one hour,
100 units---100 grams of lactose, and so on.

FCC stands for Food Chemical Codex, which is a standard for enzyme units that has been set by the FDA--I couldn't find out what this exact
amount was for lactase, but it's used for other consumable enzymes as well.