Dextromethorphan is the most potent anti-tolerance medication you can get your hands on, and it doesn't dampen any effects like ALCAR can.

I used to experiment heavily with all kinds of supplement routines and other nootropics when I had my Adderall Rx.

ALCAR works but like you mentioned, it does blunt things a bit.

https://clinicaltrials.gov/ct2/show/NCT03729128

https://link.springer.com/article/10.1007/s11373-006-9096-4

Dextromethorphan works for tolerance on things other than Amphetamine as well, but that's outside the scope of the conversation.

FWIW, the best I ever felt was on Adderall + 200mg l-Theanine + 10mg Noopept + 15mg Dextromethorphan.