http://en.wikipedia.org/wiki/Ractopamine
Ractopamine is a drug that is used as a feed additive to promote leanness in animals raised for their meat. Pharmacologically, it is a beta-adrenoceptor agonist. It is the active ingredient in products known as Paylean for swine and Optaflexx for cattle, developed by Elanco Animal Health, a division of Eli Lilly and Company, for use in food animals for growth promotion.
Ractopamine has been banned in the European Union, mainland China and Russia.[1][2]
===
From Mercola
The beta agonist drug ractopamine, which reduces the overall fat content of meat, is currently used in about 45 percent of US pigs, 30 percent of ration-fed cattle, and an unknown percentage of turkeys. Up to 20 percent of ractopamine remains in the meat you buy from the supermarket.
===
From Me:
… another reason to stay away from store bought, feed lot fattened meat.
ACK !