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pl-tryptophan is the amino acid that serves as the precursor for the synthesis of serotonin and melatonin to promote healthy moods and sleep cycles-ppl-tryptophan is an essential amino acidmdashldquoessentialrdquo means the body canrsquot synthesize it and must acquire it through diet this amino acid is pivotal for the production of serotonin melatonin and niacin serotonin and melatonin stabilize both mood and sleep patterns niacin regulates digestive function for effective metabolism of proteins fats and carbohydratesbr - br - supplementation with l-tryptophan can also increase levels of the chemical messengers dopamine and norepinephrine neurotransmitters that affect pleasure and alertnessbr - new roots herbalrsquos l-tryptophan is an excellent choice to supplement levels of the critical compound that deplete as we age and can prove useful for insomnia mood enhancement and overall well-being nbsp nbsp-p