L-Tryptophan Powder

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Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 - 4 and pay only $11.99 each
Buy 5 - 8 and pay only $10.99 each
Buy 9 or above and pay only $9.99 each
  • L-Tryptophan Powder
  • L-Tryptophan Powder
  • L-Tryptophan Powder



L-Tryptophan is an essential amino acid, meaning it is essential for human life as our bodies do not synthesize this amino acid and must be taken in by our diet. Many of the amino acids are building blocks for protein biosynthesis and L-Tryptophan in particular is an precursor to Serotonin and Melatonin, neurotransmitters that regulate mood, sleep, and appetite.

Our L-Tryptophan is made synthetically from plant based materials and is not derived from animal derivatives. NON-GMO and Vegan safe.

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. Re-seal zipper immediately after use to preserve freshness.

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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