adderall

So I've seen a video recently of someone saying there experience taking adderall when they don't have ADHD and was saying how it makes them lock in getting stuff done. Got me wondering now weather or not there is any sort of peptide or drug that does this? Like specifically makes you "lock...

Curious if anyone has used amphetamines during their contest prep? Mostly to curb appetite and keep energy/motivation levels up. I'm aware it supposedly "makes you lose muscle", but in my experience I've been on it over a year and I believe it's all about the diet. Made great gains in 2015...