Highest Quality Supplements Since 1980

Read (0) Reviews
Write a Review

L-Tryptophan USP

500 mg 60 capsules: Craig Nutraceuticals
Item# 02139

Retail Price: $39.99

Your Price:

Your favorite Life Extension® products can be delivered to you automatically. Just look for the “AutoShip” button. Select AutoShip, and choose your preferred ship-out date. It's that easy!


  • L-Tryptophan USP
  • 500 mg 60 capsules: Craig Nutraceuticals
  • Item Catalog Number: 02139

L-tryptophan is an amino acid that is used to promote relaxation, and is taken before sleep or prior to or during anxiety provoking situations. L-tryptophan can also be used to help prevent carbohydrate cravings.


Supplement Facts

Serving Size 1 capsule

Servings Per Container 60

Amount Per Serving

Pure L-Tryptophan

500 mg

Other ingredients: gelatin capsule, vegetable stearic acid, silica, plant cellulose.

Dosage and Use
  • Adults, Take one or two capsules 15 to 30 minutes before bedtime with 6-8 oz. of water or a small amount of carbohydrate such as diluted fruit or vegetable juice to facilitate uptake.
  • Should not be taken with milk, hot fluids, or other proteins (recommended 1 hour to either side of protein).
  • Make sure that a good B-Complex is taken during the day with a balance of B-2 (Riboflavin), B-3 (Niacin), and especially B-6 (Pyridoxine) to maximize serotonin production.
  • Do not exceed 5 capsules or 2.5 grams per day unless directed by your physician.

If you are pregnant, nursing, or using medications (most importantly certain classes of anti-depressant drugs), consult your doctor before using. As with any dietary supplement, if any adverse reaction should occur, discontinue use.


Product reviews are provided for informational purposes only and reflect solely the views and opinions expressed by the contributors and not those of Life Extension. We do not verify or endorse any claims made in these reviews. Please read the full product reviews disclaimer.