When levels of these two highly important brain chemicals get too low, we feel an overwhelming sense of sadness, and consequently, become depressed. (eocinstitute.org)
Serotonin is one of the most important brain chemicals for regulating the sleep / wake cycle. (paosfitworld.com)
Also, methionine is converted in your liver to SAM - e (s - adenosylmethionine), which is anti-inflammatory, supports your immune system and helps produce important brain chemicals serotonin, dopamine and melatonin. (nicolejardim.com)