[sillysaurusx]

There's also a massive difference in what exactly you're doing. Adderall != speed != Vyvanse, and different brands of Adderall have different effects.

You can find a detailed list here: https://astralcodexten.substack.com/p/know-your-amphetamines

(My own experience is limited to various brands of Adderall, Core Pharma being the worst, before settling on Teva for many years now. Having a good doctor who watches out for your health is important, and it's part of what helped me find a winning combination.)