Magnesium contributes to the normal functioning of the nervous system. It's a cofactor in the pathway that governs how a nervous system settles down at the end of the day — the mechanism behind falling asleep and staying asleep.

Magnesium contributes to normal muscle function. It governs the release side of the contract-relax cycle — which is why deficiency shows up as tension you can feel, in the jaw or the calves, not just tiredness you can name.

Magnesium contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue — the biochemical baseline everything else in the day runs on.

Magnesium contributes to normal psychological function. Deficiency tends to show up first as a short fuse and a mind that won't settle.

Magnesium contributes to the maintenance of normal bones and teeth — a slower, structural role, alongside its evening one.

Magnesium contributes to electrolyte balance — the same system that governs hydration and, alongside sodium and potassium, muscle and nerve signaling.

Magnesium contributes to the normal function of the immune system.

Magnesium is involved in the process of cell division — one of the more fundamental roles it plays, even though it's the least visible day to day.