yo if they are perks the should say UNDO or something like "5525" im not sure and if they say "TEC" they are good too. i just bustem up and sniff it all makes you fell good. im in canada so i duno if there differnt. and the best way its to snort em i just do a whole pill ussually. It just makes you feel good is the only way i can describe it. i just sink into the couch after i do one.