What is BHA and why is it in beer?

I just saw a list with the “11 Scariest Things in Your Food” and saw a reference to Butylated HydroxyAnisole (or BHA). Among the foods listed for this ingredient was “beer.” Looks like it’s some kind of preservative, but I’ve never used it to my knowledge. Does anybody know anything about this? What commercial beers would it be used in?

Okay, here’s a10 second expert opinion on what it is.  It is used to collect free radicals a.k.a. oxgen that may casue food spoilage.  In beer that would be oxidation.  It also appears to be a debate about toxicity when consumed in large amounts.

Other than that I have no information.  We now return you to your regularly schecduled forum.  8^)

Paul