there is plenty of evidence that these amphetamines show very different effects in ADHD vs non ADHD individuals. this is my first google hit for the search phr

there is plenty of evidence that these amphetamines show very different effects in ADHD vs non ADHD individuals. this is my first google hit for the search phrase "methylphenidate in non adhd vs adhd" https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3489818/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3489818/ this is referencing several clinical studies in that vein. and the search result has several more results, some just clinics which make the well founded claim in simpler terms, others more clinical papers. I'm sure you find more going to Google scholar with your search.