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L-Tryptophan Pure Powder 100g (3.52oz)

L-Tryptophan Pure Powder 100g (3.52oz)
Item# L-Tryptophan-100g
Availability: Usually ships the same business day

Product Description

This item

is one pack of 100 grams (3.52 oz) L-Tryptophan pure powder, free base form, with US Pharmacopeia (USP) Quality. It is pharmaceutical quality grade. There is not any additive or filler inside. Manufacturer assayed as >99%. There are 1 to 1.5 years shelflife available.

Appearance: White to yellowish crystalline powder. Taste: Very slightly bitter taste. Solubility: Slightly soluble in water, mixable in cold water. Store in cool and dry place, keep away from strong light and heat.

This L-Tryptophan base form pure powder is good for direct consumption, formulation, health product R&D (research and development), or your business purpose.

Generally Suggested Use: For adult, to take flat 1/2 teaspoon (0.5g) powder 1 to 3 times daily with water or juice on an empty stomach, or as directed by your physician. For sleep aid, best used before bedtime. Or, for your formulation, R&D, and your other use purpose.

More packs and packing sizes are available, please review our store.
Please contact for bulk quantity order. We do combine shipping, you will save shipping cost.

Health Benefits of L-Tryptophan:

Promotes Restful Sleep
Encourages Positive Mood and Emotions
Supports Relaxation
Supports Weight Management Efforts

L-Tryptophan is an essential amino acid. It is a precursor of serotonin and melatonin. L-Tryptophan is metabolized by enzymes to form the intermediate amino acid 5-HTP (5-hydroxytryptophan) and then serotonin. L-tryptophan is also the metabolic precursor to melatonin and to the B vitamin niacin (B3). Both serotonin and melatonin are important to regulate mood and stress. Serotonin plays important roles in the body for sleep, mood, appetite, muscle contraction, and some cognitive functions including memory and learning. Though there are many dietary sources of serotonin, unlike its precursors L-tryptophan and 5HTP, serotonin does not cross blood-brain barrier, which means that ingesting serotonin in the diet has no effect on brain serotonin levels.
As proven by many studies, L-tryptophan is a potent nutrient to enhance restful and peaceful sleep, and also to effectively provide a remedy for occasional sleepless. There is not feeling of next-day drowsiness to take L-tryptophan. The body requires adequate sleep to regenerate and repair essential body functions and allow us to feel refreshed. Sleeping well is a necessity for maintain proper health.
Clinical studies show that L-tryptophan supplementation can positively affect healthy mood and emotional well-being. Supplementation with L-tryptophan can cause in increase in happy facial expression, a decrease in negative and disgusted facial expressions, and decrease in the attention paid to negative words. A study also indicated that supplementation L-tryptophan with one gram three times per day significantly decreased quarrelsome and aggressive behaviors while enhancing agreeable behaviors in everyday social interactions. A double blind placebo-controlled study found that two grams of L-tryptophan administered three times a day, from the day of ovulation to the third day of menstruation (the luteal phase) in healthy women, significantly relieved the most prominent mood symptoms associated with PMS. After three months of use, women taking L-tryptophan experienced statistically significant control of extreme mood swings, sadness, irritability, and tension. It also improved their perceived quality of life (A placebo-controlled clinical trial of L-tryptophan in premenstrual dysphoria. Steinberg S, Annable L, Young SN, Liyanage N.; Department of Psychiatry, St. Mary's Hospital, Montreal, Quebec, Canada.;Biol Psychiatry. 1999 Feb 1; 45(3):313-20.).
L-tryptophan may play a supportive role in helping individuals who are currently involved in weight management programs and diets by helping to reduce carbohydrate cravings. During dieting, serotonin levels drop dramatically. Serotonin plays a role in controlling appetite, and eating carbohydrate-rich foods increases serotonin levels in the brain. This may explain carbohydrate cravings and resultant binge eating in some dieters. While no human trials have examined L-tryptophan supplementation directly, a number of clinical trials have used supplemental 5-HTP, the amino acid produced in the body from L-tryptophan. Results of these trials have shown decreases in overall food intake and a subsequent reduction in weight in individuals taking 5-HTP. ([1]. Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan.Cangiano C, Ceci F, Cascino A, Del Ben M, Laviano A, Muscaritoli M, Antonucci F, Rossi-Fanelli F. 3rd Department of Internal Medicine, University of Rome, La Sapienza, Italy. Am J Clin Nutr. 1992 Nov; 56(5):863-7. [2]. A functional food product for the management of weight. Bell SJ, Goodrick GK. Functional Foods, Inc., Belmont, MA 02478, USA. Crit Rev Food Sci Nutr. 2002 Mar; 42(2):163-78. [3].The effects of oral 5-hydroxytryptophan administration on feeding behavior in obese adult female subjects. Ceci F, Cangiano C, Cairella M, Cascino A, Del Ben M, Muscaritoli M, Sibilia L, Rossi Fanelli. Department of Internal Medicine, University of Rome La Sapienza, Italy. J. Neural Transm. 1989;76(2):109-17.) It is likely that L-tryptophan supplementation would have similar effects.

Caution: If you are taking anti-depressant medications, please ask your physician before taking L-Tryptophan.

Quality Specification:

The L-Tryptophan powder was produced according to USP/AJI quality standards. Please check general quality specification details, click here. All actual batch L-tryptophan powder meets or is better than the quality specification requirements.

Shipping and Handling:

We only collect reasonable shipping and handling (S&H) fee.If you order different items at once, we try to do combine shipping in one package, and always figure out the best way to ship your order for saving your shipping cost. Maybe you will be charged excessive shipping fee for multi-item one time order by the automatic computer system, please just go ahead to check out and complete your order. We will fairly credit back your excessive shipping fee after we ship your order.
Since international shipping is complicated, and different country has different regulation for the same product, international buyer may not directly check out and complete your order from our web store. * Please be aware we will not refund any international package which international buyer refuses to pay customs duty or tax or unconfirmed shipping address or customs issue . It is your responsibility to contact with customs to verify restrict or ban some of the product. We do not refund to you if your package are confiscated / destroy/held /seized by your country's customs. Please send us email at to tell us the name and quantity of the products(s) which you decide to order. We will then send you Paypal invoice manually. You can make payment directly with your credit card, or Paypal account, after you receive the Paypal invoice.


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


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* The information provided on this site is for general information and knowledge purpose, not a health care professional advice. Please read the whole description carefully, and consult your doctor and/or pharmacist, before you decide to order for yourself direct consumption. Pregnant or lactating women, diabetics, hypoglycemics, and people with known medical conditions, including any allergy, and/or taking drugs, should consult with a licensed physician and/or pharmacist prior to starting any supplementation program. **Disclaimer: These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. ***Not responsible for typographical errors or misprints. Product availability, pricing, shipping policy, and promotions are subject to change without notice. We reserve the rights of final explanation of this website.

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