You’re right about the dose in the study, which I mention in the article as well. I never specified the best dose for individuals because the research isn’t there yet. There haven’t been many studies on this topic and it’s unclear whether a lower dose would offer the same benefits (the study didn’t test that). You would need to take multiple doses of some of the listed supplements to get that amount, yes. But, some people may want to start smaller and see if they get benefits. After all, some people won’t be deficient in magnesium to begin with.