Generally speaking (there are exceptions) ADHD people do not experience euphoria when taking stimulants. I never have, not even the first time. It’s known as the paradoxical reaction.
Some people do develop tolerance, but usually building an off day into the schedule is enough to counter that.
that is absolutely just straight up untrue. Yes excessive stimulant usage depletes magnesium, mostly cause you forget to eat. And yes for both vyvanse and adderall, if your stomach is too acidic it will decrease bioavailability, but neither of things things have anything to do with tolerance, which accrues on a semi-permanent basis every time you take the drug.
Some people do develop tolerance, but usually building an off day into the schedule is enough to counter that.