Well, I am from Eastern Europe, we don't have....legally prescribed amphetamines here like you guys have in US, so I don't really know what Adderall or Vyvanse really is. We used to have that niche industry in the socialist times (long story), so what happened after the regime collapsed, many of the people that were employed there went on working for the criminals, good side of this being they knew how to produce it good and pure. It was very popular here circa 90s - beginning of 00s but AFAIK it gradually got replaced by the shady self-taught chemists' meth. I am not sure whether I can find it even if I want to nowadays (not that I bothered anyway). TBH sometimes I miss it, it was fun though also evil. Maybe I would be using it now in a more responsible manner as compared to then, just like with M, which I abused quite a lot too back then.