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Now Foods, L-Tryptophan, Double Strength, 1,000 mg, 60 Tablets

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Now Foods, L-Tryptophan, Double Strength, 1,000 mg, 60 Tablets

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Now Foods, L-Tryptophan, Double Strength, 1,000 mg, 60 Tablets

In Stock
  • Expiration Date: July 2019
  • Shipping Weight:
    0.3 lbs
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  • Product Code: NOW-00169
  • UPC Code: 733739001696
  • Package Quantity: 60 Tablets
  • Dimensions:
    2.4 x 2.4 x 4.4 in, 0.25 lbs
    Switch to Metric units

Product Rank:

#62 in Amino Acids >
Frequently Purchased Together
Product Overview


  • Supports Relaxation
  • Encourages Positive Mood
  • Promotes Restful Sleep
  • Non-GMO
  • A Dietary Supplement
  • Vegetarian/Vegan
  • Amino Acids
  • Family Owned Since 1968
  • GMP Quality Assured

NOW Double Strength L-Tryptophan has twice the L-Tryptophan (1000 mg per tablet) as in our regular strength product (500 mg per capsule).

L-Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet. L-Tryptophan is critical for the production of serotonin and melatonin, which help to support positive mood, healthy sleep patterns, and proper immune system function. Every lot of NOW L-Tryptophan is tested to be free of Peak E and microbial combination.

Suggested Use

Take 1 tablet 1 to 3 times daily on an empty stomach, with final dose at bedtime, or as directed by your physician.

Other Ingredients

Cellulose, stearic acid (vegetable source), croscarmellose sodium, magnesium stearate (vegetable source), silica and vegetable coating.

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.


For adults only. Consult physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Keep out of reach of children.

Do not eat freshness packet. Keep in bottle.

Natural color variation may occur in this product.

Store in a cool, dry place after opening.

Supplement Facts
Serving Size: 1 Tablet
  Amount Per Serving % Daily Value
L-Tryptophan (Free-Form) 1 g (1,000 mg) *
*Daily Value not established.
iHerb Customer Reviews

Great! it really helps with my symptoms.

Posted by iHerb Customer on February 5 2018 | Verified Purchase

This product works great for me, which I'll detail below. I've tried a peptide version by another brand, which did not appear to work in anyway. It took me quite a while to work out that certain activities were leaving me extra tired and unhappy the next day. However once I did notice, I started to suspect I was Serotonin deficient. Taking one tablet twice a day has helped greatly and I am no longer having those symptoms when performing those activities, plus it helped with one other symptom I hadn't linked; hunger. I was constantly hungry no matter how much I ate, now after a sufficient meal I feel satisfied. Also, I have severe digestion sensitivities (IBS / rashes / tiredness) - this product didn't trigger any of those.

Thanks for your feedback!


Posted by iHerb Customer on January 15 2018 | Verified Purchase

for my sister it's great. For me, sometimes

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Posted by iHerb Customer on January 8 2018 | Verified Purchase

Quality product.

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Ideal for sleeping

Posted by iHerb Customer on December 9 2017 | Verified Purchase

I have been working on reducing my use of Clonazepam, unsuccessfully, until using 3 of these tablets a night. They replace 1mg of Clonazepam

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Excellent for mood and cognitive boost

Posted by iHerb Customer on December 8 2017 | Verified Purchase

The effects were noticeable after only a few days. Highly recommended for depression, although if you have bipolar type 1 or 2 (mostly depression with a small bit of mania) you need something stronger like lithium.

Thanks for your feedback!