Douglas Labs L-Tryptophan

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L-Tryptophan is an essential amino acid and a precursor for the synthesis of serotonin. Tryptophan crosses the blood-brain barrier and is converted to L-5-Hydroxytryptophan (5-HTP), which in turn is converted into serotonin. Serotonin is an important neurotransmitter necessary for the regulation of appetite, mood, and melatonin production.


  • L-Tryptophan
  • Supplement Facts
  • Amount Per Serving
  • Serving Size 2 Vegetarian Capsules
  • Servings Per Container 30

each vegetarian capsule contains:

  • Vitamin C (as ascorbyl palmitate) 10 mg
  • Riboflavin (as riboflavin-5-phosphate) 10 mg
  • Niacin (as niacinamide) 10 mg
  • Vitamin B6 (as pyridoxal-5-phosphate) 10 mg
  • L-Tryptophan (as TryptoPure®) 1,000 mg
  • BioPerine® (Black pepper extract, fruit) 5 mg

Other ingredients:

  • Hydroxypropyl methylcellulose (capsule), cellulose and silica.
  • TryptoPure® is a registered trademark of Ajinomoto AminoScience, LLC.
  • BioPerine® is a registered trademark of Sabinsa Corporation.

Suggested Usage:

  • 2 daily

Douglas Labs L-Tryptophan

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