L-Tryptophan
An essential amino acid that is a precursor to serotonin and melatonin.
Also known as: Tryptophan
Overview
L-Tryptophan is an essential amino acid, meaning it cannot be synthesized by the body and must be obtained from the diet. It is a precursor to several important molecules, including the neurotransmitter serotonin and the hormone melatonin. Serotonin plays a crucial role in regulating mood, appetite, and sleep, while melatonin is responsible for regulating the sleep-wake cycle. Due to its role in serotonin and melatonin production, L-tryptophan is often used as a supplement to improve mood, reduce anxiety, and promote sleep. It is also involved in the synthesis of niacin (vitamin B3) and other important proteins in the body.
Key Benefits
Promotes Sleep
As a precursor to melatonin, L-tryptophan can help improve sleep quality and reduce the time it takes to fall asleep.
Improves Mood
By increasing serotonin levels, L-tryptophan may help improve mood and reduce symptoms of depression.
Reduces Anxiety
Increased serotonin levels may also help reduce feelings of anxiety and promote a sense of calm.
Dosage & How to Take
Dosage can vary depending on the intended use. It is best to start with a lower dose and gradually increase as needed.
| Purpose | Dose | Notes |
|---|---|---|
| Sleep | 1000-2000 mg per day | Taken 30-60 minutes before bedtime. |
| Mood Support | 500-1500 mg per day | Taken in divided doses. |
Best Time to Take
For sleep, take before bedtime. For mood support, it can be taken throughout the day.
With or Without Food
Best taken on an empty stomach to avoid competition with other amino acids for absorption.
Forms & Bioavailability
| Form | Absorption | Best For | Notes |
|---|---|---|---|
| L-Tryptophan | High | General supplementation. | The natural and most common form of tryptophan. |
| 5-HTP | High | More direct conversion to serotonin. | A metabolite of tryptophan that is closer to serotonin in the metabolic pathway. |
Side Effects & Safety
Common
- Drowsiness
- Stomach pain
- Vomiting
Rare
- Headache
- Dizziness
Contraindications
- Should not be taken with SSRIs or other antidepressant medications without medical supervision.
Interactions
May increase the risk of serotonin syndrome.
May increase the risk of serotonin syndrome.
Scientific Research
L-Tryptophan: Basic Metabolic Functions, Behavioral Research and Therapeutic Indications
L-tryptophan is critical in a number of metabolic functions and has been widely used in numerous research and clinical applications.
Influence of Tryptophan and Serotonin on Mood and Cognition with a Possible Role of the Gut-Brain Axis
Tryptophan supplementation may improve mood and cognitive function.
Food Sources
Products With L-Tryptophan
2 products in our database contain this ingredient
Frequently Asked Questions
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you have pre-existing health conditions or are taking medications. The statements on this page have not been evaluated by the Food and Drug Administration.