Serotonin

In the central nervous system, serotonin is believed to play an important role as a neurotransmitter, in the modulation of anger, aggression, body temperature, mood, sleep, sexuality, and appetite. Serotonin is known as the ‘feel good’ neurotransmitter.

Serotonin is a neurotransmitter that conveys the positive sensations of satiety, satisfaction and relaxation. It regulates appetite and when we are in the dark, it's converted to melatonin and helps us to sleep.

Biosynthesis:
L-Tryptophan - 5-HTP - Serotonin - Melatonin (Sleep)

Natural Serotonin Supplements:
L-Tryptophan, 5-HTP, St John's Wort , B6

Tryptophan occurs naturally in nearly all foods that contain protein, but in small amounts compared to the other essential amino acids. The following foods contain tryptophan: red meat, dairy products, nuts, seeds, bananas, soybeans and soy products, tuna, shellfish, and turkey.

More about serotonin at http://en.wikipedia.org/wiki/Serotonin

5-Hydroxytryptophan or 5-HTP is a naturally-occurring amino acid, a precursor to the neurotransmitter serotonin and an intermediate in tryptophan metabolism. It is marketed in theEurope, United States and many other countries as a dietary supplement for use as an antidepressant, appetite suppressant, and sleep aid.

5-HTP occurs naturally on the seed of the Griffonia Simplifica plant that only grows in Africa.