To that end, we spoke with a number of experts – including Dr Álvaro Campillo, a gastroenterologist and partner at the supplement brand Kobho Labs – for a detailed guide to benefits of magnesium, why you might need the mineral and all the best magnesium supplements. As an essential mineral, magnesium helps regulate muscle and nerve function, as well as promoting good sleep and reducing anxiety. Magnesium helps regulate neurotransmitters that calm the brain, so when levels are low, falling asleep, staying asleep, or getting truly restful sleep can become a struggle.