Every cell in the human body needs magnesium. It helps regulates neurotransmitters in the brain, helps convert food to energy, creates new proteins from amino acids, repairs and creates DNA and aides the contraction and expansion of muscles. The list goes on as it supports nearly every chemical reaction in everyone’s biological makeup. That’s way many studies suggest magnesium supplementation can help you stay calmer, fight depression, boost exercise performance, and lower blood pressure. Here are some things to think about while you shop for a magnesium supplement.