Idk if it’s definitive, but research actually suggests that caffeine does not (generally) having mitigating effects on ADHD symptoms. (Edit: after reviewing my source, this was only true for children, not for adults. Adults did show some correlation between caffeine intake and reduced symptoms)
Additionally, people with adhd aren’t more likely to drink coffee either…. But interestingly, those with ADHD who do drink coffee are more likely to “misuse” it.
Not saying it doesn’t work for you, everyone is different, but it’s just not generally supported by the science.