I purchased mine at Wal-Mart and it worked once I got at high enough levels to smell like a pancake house.
But beware - When taken at high enough levels to actually help milk production, it gave my LO HORRIBLE gas and reflux. He would even throw it up at times. I've talked to multiple other Moms who had this same problem. Heck, it even gave ME gas. And at lower levels it didn't do anything at all. And when I quit taking it, my milk production went down to levels even lower than before.