I’ve been running DR st1/st2 and Paragon, and I’ve felt a bit of my ADD-symptoms being alleviated. Better focus, more sturdy inner self, less being “all over the place”, less forgetfulness, better executive and cognitive functions, less mind fog, etc. I’ve also been more motivated to move and exercise, so that’s an added bonus 
Although, I personally believe it is just as important to examine the food and building materials you give to your body. I’ve been doing Dr Goldner’s (free) Hyper Nourishment program for a couple of weeks, and some days I feel like I’m on modafinil… I know I’ve felt improvement, but check for yourself! I’m sure there are people with ADHD that has also seen improvements.
Spoiler
It’s basically what it sounds like; you flush your body with micro-nutrients with DIY green smoothies (whole food plant based no oil, so yes, it’s vegan
), and Omega 3’s from plant sources to replace the cell walls in your body built with omega 6, with omega 3’s instead, which rapidly improves neuro-transmission throughout the body. It also lessens and fights inflammation in the system. Breakdown of omega 6 causes the release of Arachidonic acid, which has been directly linked to inflammation, which stresses basically every function in the body. Check out Dr Goldner - Goodbye Autoimmune and her other books, if you are interested.
As for alleviating ADHD/(ADD) with subs well, I think it’s possible, but it could also depend on what the hell ADHD really is. Some say it’s an expression of sorts from childhood trauma, others toxicity, others… something else. And others think it’s a evolutionary role necessary for the tribe, having people trying things and being all over so that the others can learn what works or not… I personally think it could be (in part) the result of hyperfocus gone wrong in a world where everything craves your attention nonstop, which eventually lead to catastrophic failure of the body and mind expressed as “executive and cognitive dysfunction” - so Paragon could help ease the stress of the body, and thus ease the stress of the mind, making it easier to focus = “less” ADHD. Though I am by no means an expert and only have the experience of adult ADD to draw from…
Have you had the chance to try any of the mind/focus-oriented subs, like Limitless, or Beyond Limitless?