500 mg, 90 vegetarian capsules Item # 01722

L-Tryptophan 500 mg, 90  vegetarian capsules - Life Extension

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Supplement Facts for L-Tryptophan

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500 mg, 90 vegetarian capsules Item # 01722

Our premium-quality L-Tryptophan formula helps maintain tryptophan levels to promote healthy sleep and mood, encourage a healthy stress response, promote satiety and more.

Gluten free Non-GMO Vegetarian
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$0.28 / count | 30 - 90 Day Supply
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$0.25/count | 30 - 90 Day Supply

I take it at night to aid in sleep!

Toni, Roswell

Frequently Bought Together

  • This Item: L-Tryptophan, 500 mg, 90 vegetarian capsules
  • L-Theanine, 100 mg, 60 vegetarian capsules

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500 mg, 90 vegetarian capsules


$0.28/count | 30 - 90 Day Supply

What Is L-Tryptophan?

Serotonin is a neurotransmitter in the brain associated with positive moods and restful sleep. Your body requires the essential amino acid tryptophan to produce and maintain healthy serotonin levels. Our formula delivers 500 mg of L-tryptophan that has undergone rigorous manufacturing processes to ensure the highest quality and purity.

L-Tryptophan promotes healthy sleep patterns and mood, while encouraging the body’s healthy response to stress.

L-Tryptophan Benefits

  • Supports healthy sleep & mood
  • Helps modulate your body’s natural stress response
  • Promotes satiety

Support Sleep & Stress Management

A lack of sleep can cause stress, which can lead to a lack of sleep. Break the cycle and get those sleep patterns back on track with our L-tryptophan. It contains 500 mg of L-tryptophan that has undergone a rigorous manufacturing process to ensure high quality and purity.

Why Life Extension?

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99% of our products are manufactured in the U.S, and a Certificate of Analysis is available for every product we produce.

Our premium-quality L-Tryptophan formula helps maintain healthy tryptophan levels in the body. Tryptophan promotes healthy sleep and mood, encourages a healthy stress response and more.

More facts about L-Tryptophan

These statements have not been evaluated by the Food and Drug Administration.
These products are not intended to diagnose, treat, cure, or prevent any disease.

Serving Size 1 vegetarian capsule

Amount Per Serving


500 mg

Other ingredients: vegetable cellulose (capsule), microcrystalline cellulose, carboxymethyl cellulose, stearic acid.


Dosage and Use
  • Take one (1) capsule 1 to 3 times daily on an empty stomach, or as recommended by a healthcare practitioner.
  • For maximum absorption, take with a small amount of carbohydrate, such as diluted juice.
  • Best if taken separately from protein and amino acids.

Consult your healthcare provider before using this product if you are taking medication for mood concerns, such as MAOIs or SSRIs. Use caution before driving or operating heavy machinery

  • Do not purchase if outer seal is broken or damaged.
  • When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.

To report a serious adverse event or obtain product information, contact 1-866-280-2852.

Actual Size

Pill Size Image
  1. Rev Neurol (Paris). 2001;157(11 Pt 2):S16-9.
  2. Nutrients. 2016;8(1):1-15.
  3. PLoS Comput Biol. 2008;4(2):e4.
  4. Int J Tryptophan Res. 2009;2:45-60.
  5. Int J Tryptophan Res. 2018;11:1178646918802282.
  6. Arch Psychiatr Nurs. 2015;29(2):102-7.
  7. Psychoneuroendocrinology. 2013;38(2):201-8.
  8. Sci Rep. 2016;6:35727.
  9. Rev Assoc Med Bras. 2011;57(1):74-7.

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