Can I get a definitive answer on the degree of neurotoxicity in pharmaceutical-grade
amphetamines? I understand that a question like this rarely has a simple answer, and that the long-term effects of amphetamine use are mediated by a huge number of factors specific to the individual, but are there any general findings supported by good research that can serve as guidelines for safe/responsible use?

I know that the nature and legitimacy of 'ADHD' is a major point of contention on this board, so I apologize in advance if I've drifted out of my depth here.