Very interesting.
Is it also used to cleave off the amphetamine slowly and make it XR, a bit like lysene?
FTR any "official" amphetamine tablets you can source in the UK, largescale, which aren't like a tenner a pill even in bulk, is likely fake. Maybe still contains what they say, maybe even consistent, or maybe not. But fake. I had a friend at a pharmacy who could aquire things, some harder than others, but Im not even sure he even handled amphetamine. Any legit amph in the UK is going to be someones script.