L-Tryptophan (Source Naturals) Each bottle, 30 capsules. Each capsule contains 500 mg of the amino acid, L-tryptophan. In addition, the tablets contain stabilizers and such which results in a tiny amount of iron (575 mcg per cap). These other ingredients include gelatin, colloidal silicon dioxide and magnesium stearate.

This amino acid is the immediate precursor of the brain chemical, serotonin. Serotonin is involved in a number of both mood and cognitive activities, among other actions. Studies suggest that it may have some benefit in managing depression, insomnia and other conditions. Stay tuned: more information to come!

Suggested use is 1 tablet three times daily between meals. Or, you can use three tablets before bedtime to help with a more restful sleep.

See also 5-HTP. Do not use with other SSRI or MAO inhibitor drugs.