There’s evidence that taking magnesium supplements, a common and necessary mineral, can help manage ADHD symptoms. Cognitive (Mental) FunctionResearch suggests that magnesium supplements may help with cognitive symptoms of ADHD, which involve thinking and planning. Potential Benefits of Taking Magnesium for ADHDResearchers have found several ways that magnesium supplements may help with certain ADHD symptoms. Compared to children taking a placebo, researchers found children taking magnesium to be better able to organize and complete tasks, listen when spoken to, and follow instructions. Compared to children taking a placebo, researchers found children taking magnesium to be better able to organize and complete tasks, listen when spoken to, and follow instructions.