I also saw a study that said that 95% of children diagnosed with ADHD are magnesium deficient [0]! Another found a "significant decrease of hyperactivity" in children who were given oral magnesium supplements over 6 months [1].
My wrists and hands have felt better, but I've given a lot of attention to them in addition to the supplements, with more upper body workouts (on top of running 10-15 miles a week) and stretches. I'm looking to get more ergonomic tools as well. While I can't say what is and isn't due to the supplements, I don't currently see a reason to stop taking them.
[0] https://pubmed.ncbi.nlm.nih.gov/9368235/ [1] https://pubmed.ncbi.nlm.nih.gov/9368236/