Harvest Naturals

L-Tryptophan Powder

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  • L-Tryptophan Powder
  • L-Tryptophan Powder
  • L-Tryptophan Powder



What Is L-Tryptophan?
L-Tryptophan is an essential amino acid. It is necessary for human life as our bodies do not synthesize this amino acid and must be taken in by our diet. Many amino acids are building blocks for protein biosynthesis, and L-Tryptophan, in particular, is a precursor to Serotonin and Melatonin, neurotransmitters that regulate mood, sleep, and appetite. Though L-Tryptophan is commonly obtained through foods such as chicken, eggs, fish, cheese, and turkey, Harvest Naturals L-Tryptophan is made synthetically from plant-based materials and is NON-GMO and Vegan safe.

Potential Benefits of L-Tryptophan:

  • May promote better sleep †
  • May increase mood stability †
  • May reduce symptoms of Anxiety †

How Does L-Tryptophan Work?
L-Tryptophan is an essential amino acid that creates niacin, an integral factor in creating the neurotransmitter serotonin. Tryptophan converts into 5-HTP, or 5-hydroxytryptophan, which then produces serotonin. Serotonin, though it affects several systems, is primarily responsible for regulating both mood and sleep. Being an essential amino acid tryptophan is not created by the body and needs to be obtained through diet or supplementation.

Consider This:
Try pairing our L-Tryptophan with either our L-Theanine or L-Glycine for maximizing the results of those rest days that your body needs to recuperate.


Directions & Allergens

Suggested Use:
As a dietary supplement, take 2 rounded scoops (~500 mg) mixed with 8 ounces of water or suitable beverage. Taken 1 - 3 times daily with meals or as directed by a qualified health professional.

This product contains no Soy, Dairy, Dairy byproducts, Eggs, Fish, Shellfish, Wheat, Gluten, Tree Nuts, or Sesame Seeds.

This is a NON-GMO ingredient manufactured using organic starting ingredients.

Store in a cool, dry place. Keep away from direct sunlight and heat.

Instant COA 

Another HR Supplements exclusive is the “Instant COA” (Certificate of Analysis). We have built a customer facing interface that will allow you to view product COA's on any mobile device. Simply scan the Quick Response (QR) code on the HR Supplements product label and instantly view the lab reports. Please click here to request a copy of archived COA's.  


Statements & Warnings †

† These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any diseases.

Keep out of the reach of children. Do not take this or any other supplement if under the age of 18, pregnant or nursing a baby, or if you have any known or suspected medical conditions and/or taking prescription drug(s) or OTC medication(s). Always consult with a qualified health physician before taking any new dietary supplement.

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2 Reviews

  • 5
    Best brand

    Posted by Kristin Osmar on 23rd Feb 2017

    I've used several brands of l-tryptophan and found Hard Rhino to be the best. It helps me sleep, at least helps to get to sleep at night.I still don't sleep all night but at least can get right to sleep at 9:30 pm and sleep 5-6 hours. I feel Hard Rhino is a good, trustworthy company.

  • 5
    Excellent Product

    Posted by Dave on 2nd Dec 2014

    I like the fine consistency about the Tryptophan from Hard Rhino. It blends well and works!

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