Magnesium is a mineral involved in over 300 chemical reactions in our bodies! Studies have examined how consuming magnesium may be associated with lower serum cortisol (which means lower stress) and higher serum melatonin (the hormone that regulates our circadium rhythm). In general, it seems magnesium may be able to relax the central nervous system. In one study, for example, when adults with insomnia took magnesium, they reported a longer sleep time and a lower score on the insomnia severity index. We use the form magnesium citrate because it's highly bioavailable.