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L-Tryptophan is an amino acid, a protein building block that can be found in many plant and animal proteins. It's called an “essential” amino acid because the body can’t make it. It must be acquired from food.

L-Tryptophan is used for insomnia, sleep apnea, depression, anxiety, a severe form of premenstrual syndrome called Premenstrual Dysphoric Disorder (PMDD), smoking cessation, Attention Deficit-Hyperactivity Disorder (ADHD) and Tourette's Syndrome.

How Does It Work?

L-Tryptophan is naturally found in animal and plant proteins. It is important for the development and functioning of many organs in the body. After absorbing L-Tryptophan from food, our bodies convert it to 5-HTP, and then to Serotonin. Serotonin is a hormone that transmits signals between nerve cells. It also causes blood vessels to narrow. Changes in the level of serotonin in the brain can alter mood.