Magnesium

Magnesium (Mg) is an essential component of tissues (10-15 mmol/kg, mainly intracellular) and body fluids (0.9-1.0 mmol/l serum). Magnesium is an activator of numerous enzymes, is involved in all ATP-dependent reactions and partly plays a calcium-antagonistic role.

https://de.wikipedia.org/wiki/Magnesium _{(Wikipedia CC-by-sa-3.0)}