IMO the product was yanked because it was a key ingredient in the manufacture of methamphetamine, rather than actual serious health effects, although I wouldn't reccomend taking alot of them because it is, after all, a key ingredient in METHAMPHETAMINE...
But, uhm, good times.. don't take more than six, really.. i mean it..
I bought my last bottle at GNC about a year ago.. not sure if they've finially got around to banning it up here in the Great White North or not.. might be worth a look.
Devin