Stimulants will help anyone focus, ADHD diagnosis or not.
To refocus the conversation, the specific trope I see again and again is “stimulants will make a person with ADHD calm and a person without ADHD hyper”, which I do not believe is true. If there’s a paper that provides evidence for that I’d still love to see it.
Neither is such a statement made on the product labels.
I have seen such absolute statements along such lines made in the popular press and their online equivalent, but I'd rather leave toilet paper out of the discussion.
So by all means, do not believe the statement is true, but understand that there is, in fact, no broad acceptance or community belief of such an absolute statement being true, and furthermore, rather crucially, that what you may believe has no bearing whatsoever on the veracity of individual experiences.
Consequently, even the anecdotal reports have continuing clinical relevance, because:
* Medicine is the field of treating a patient, and if the result is a better adjusted, rested, and socially engaged individual, then any such observed effect for the individual patient calls for psychiatric consideration. What such effects are not, is diagnostic, or the basis for a product claim; and,
* Science is the field of explaining phenomena, and the reports are not adequately explained by the research, in large part because the wide gamut of behaviours, symptoms, mechanisms, measures, and outcomes collectively labelled "ADHD" are themselves a very poorly explained and haphazardly classified selection of neurological variations from the population majority. This being, of course, a very common circumstance in the young field of psychiatry.
All of which means there is no such paper, and besides, no-one is even writing one.
> specific trope I see again and again is “stimulants will make a person with ADHD calm and a person without ADHD hyper”, which I do not believe is true This statement is compacted and leaves out some things. I have a bad case of the inattentive adhd variant. With that came that I am really bad at filtering out sensory stimuli of any kind, sound, light, touch. They feel "loud" and prevent me from focusing for example on a conversation with a person. However stimulants increase my ability to tune out these distractions. For me stimulations were such a relieve after over 35 years to not be bombarded with sensory stimuli and finally being able to quieten this noisy mess, that made me a lot calmer - even when I am pausing medication for a few days. So believe what you want, me and others who take the medication are glad for the relieve it provides. However many websites use tropes you mentioned in a way that makes ADHD seem not very credible. It is important to differentiate between medical facts and for example websites that try to make people seek treatment by a healthcare professional. With such deseases often come secondary psychological problems that may cause a suffering person not to seek treatment. So some websites try to break through this barrier.
Then why do you think stimulant medications were ever approved for adhd treatment?
Of course they were work differently for people with and without adhd. For people without adhd the stimulant medications do not treat the adhd. If you try to sort of isolate out that part of it... what are you expecting to find?