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TryptoPure® L-Tryptophan 90 capsules.
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TryptoPure® L-Tryptophan 90 capsules.

TryptoPure® L-Tryptophan 90 capsules.

90 vegetarian capsules
TryptoPure® L-Tryptophan 90 capsules.
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L-Tryptophan is an essential amino acid, which means it cannot be synthesized by the human body and therefore must be part of the diet or supplementation. The best sources for tryptophan are high-protein foods such as oats, bananas, dried dates, dairy products, fish, many nuts, and poultry.

Tryptophan is critical in helping your body produce proteins for muscle, hair, and skin. Unfortunately, tryptophan is the least abundant amino acid in your diet. Even a person on a high-protein diet gets less than 1.5 grams of tryptophan a day. What’s more, when you ingest tryptophan it undergoes degradation processes that dramatically reduces the amount actually available for conversion to serotonin in the brain. Some experts estimate that only 1% of the dietary tryptophan you take in reaches the brain. For some this is sufficient, but for others, low levels can adversely affect sleep, weight, and mood.

Tryptophan is a precursor for serotonin. Unlike other products that influence serotonin reuptake, L-tryptophan is a direct precursor that results in almost immediate increases in serotonin, which is one of the primary neurotransmitters involved with sleep and mood.

In those people with low serotonin levels, L-tryptophan has been shown to help establish and maintain healthy levels, which may help to improve mood9 and reduce tension. In those people with serotonin levels already within the normal range, L-tryptophan acts as a natural sleep aid, not only helping people fall asleep, but also helping them stay asleep throughout the night and wake without grogginess. For this reason, some experts believe tryptophan can be a safe and effective sleep aid when added to your diet as a supplement. Supplementing your diet with tryptophan, specifically TryptoPure®, may mean a more restful night’s sleep, a brighter mood, and a host of other benefits.

TryptoPure® is the most trusted tryptophan available today. TryptoPure® is suitable for vegetarians, additive-free, solvent-free, 100% fermented, and GMP certified.

Supplement Facts

Serving Size 1 vegetarian capsule

Servings Per Container 90

Amount Per Serving

TryptoPure® L-Tryptophan (100% pure USP pharmaceutical-grade L-tryptophan)

500 mg

Other ingredients: vegetable cellulose (capsule).

This product contains NO milk, egg, fish, peanuts, crustacean shellfish (lobster, crab, shrimp), soybeans, tree nuts, wheat, yeast, gluten, corn, or rice. Contains NO sugar, and no artificial sweeteners, flavors, colors, or preservatives.

TryptoPure® is a registered trademark of Ajinomoto Company, Inc.

Dosage and Use

Take one capsule one to three times daily, or as recommended by a healthcare practitioner.

For maximum absorption, take with six to eight ounces. of water or a small amount of carbohydrate such as diluted juice.

Take separately from food or supplements containing protein or amino acids.

Vitamin B6 is an essential cofactor in the conversion of L-tryptophan to serotonin in the body, while niacinamide plays an important role in enabling the body to properly utilize amino acids like tryptophan. Therefore, those taking L-tryptophan may find optimal results by consuming a B-complex supplement during the day that provides at least 50 mg of niacinamide and 50 mg of vitamin B6.


Serotonin syndrome is characterized by high levels of serotonin and symptoms like confusion, sweating, agitation, nausea, involuntary muscle contractions, and racing heartbeat. Do not take L-tryptophan if you experience these symptoms. Do not take L-tryptophan in combination with other agents that increase serotonin levels in the central nervous system. Agents that increase serotonin levels can include psychiatric medications (e.g., antidepressants, lithium), migraine medications (e.g., sumatriptan), Parkinson’s disease medications (e.g., carbidopa), and dextromethrphan, an over-the-counter cough suppressant. Do not use before driving or operating heavy machinery.

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