I'm actually trying to boost dopamine levels without stimulating the body too much.
That's where it gets tricky because anything that works on dopamine is inevitably a stimulant and most likely will increase other catecholamines (norepi/epi) as well.
I take N-Acetyl-L-tyrosine for that and it works but not nearly as efficient as Sulbutiamine. Also all stimulating supplements even natural ones trigger severe tension headaches, anger outbursts and ultimately lead to adrenal crashes in my case.
I've been using PEA occasionally but it's a very potent stimulant in my opinion although it works on dopamine very well.
I wish I never took Ritalin. It sounds innocent because they give it to kids but it's a powerful drug and should be treated as such. It did not cause my AF directly but it allowed me to progress to its latest stages.