• Product Name:L-Tryptophan
  • Molecular Formula:C11H12N2O2
  • Purity:99%
  • Molecular Weight:204.228

Product Details;

CasNo: 73-22-3

Molecular Formula: C11H12N2O2

Appearance: White to off-white crystalline powder

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  • Molecular Formula:C11H12N2O2
  • Molecular Weight:204.228
  • Appearance/Colour:White to off-white crystalline powder 
  • Vapor Pressure:8.3E-09mmHg at 25°C 
  • Melting Point:289-290 °C (dec.)(lit.) 
  • Refractive Index:-32 ° (C=1, H2O) 
  • Boiling Point:447.908 °C at 760 mmHg 
  • Flash Point:224.687 °C 
  • PSA:79.11000 
  • Density:1.363 g/cm3 
  • LogP:1.82260 

Pure L-Tryptophan Amino Acid Powder Tryptophan CAS 73-22-3

L-Tryptophan is an essential amino acid crucial for protein synthesis and various physiological functions in the body. It is naturally found in foods like red meat, poultry, eggs, and dairy products. L-Tryptophan is not synthesized by the body and must be obtained from the diet.

Products Description

Product Name: L-trptophan

Specification: 99%

Cas No: 73-22-3

Molecular formula: C11H12N2O2

Appearance: Off-white Crystal Powder.

Storage: Store in cool & dry place, Keep away from strong light and heat.

Shelf Life: 24Months when properly stored.

Grade: Food grade/Medicine/Injection grade



One of the key benefits of Tryptophan is that it may help to decrease appetite and reduce symptoms of depression and anxiety. Studies have shown that low levels of Tryptophan in the body may lead to anxiety disorders and depression.

It has also been shown that the Serotonin resulting from Tryptophan has a limiting effect on appetite and may help to reduce caloric intake and weight in obese people. Tryptophan is further used to synthesize Niacin, which is used in the processing of carbohydrates and fats.

Tryptophan supplementation may also encourage healthy sleep patterns. These benefits seem to be directly related to the release and synthesis of Serotonin and Melatonin. Tryptophan is capable of maintaining a fairly consistent level of Serotonin throughout the day and aids in the production of the proper level of Melatonin at night.

This makes Tryptophan distinct from the other well-known Serotonin precursor (and Tryptophan metabolite), 5-HTP. When ingested orally, 5-HTP is not subject to any rate-limiting factors, which means there is no control on how high Serotonin levels may go.

Consequently, Tryptophan’s effects may be less noticeable than 5-HTP, but with potentially fewer side effects.

There are a number of medical conditions which Tryptophan is able to improve. A 2010 study showed that Tryptophan may halt the spread of a common liver condition known as steatohepatitis.

Tryptophan may also be capable of improving conditions associated with irritable bowel syndrome (IBS). It has been shown that the less Tryptophan a person has in their body, the more serious the symptoms of this condition can be.


Function & Application:

Nutritional: L-Tryptophan is essential for protein synthesis and is important for the proper functioning of many organs in the body. It is a fundamental building block for proteins.

Mental Health Disorders: Some individuals use L-Tryptophan for managing certain mental health disorders, although scientific evidence supporting its efficacy is limited. It is sometimes used to alleviate symptoms of depression and anxiety due to its role in serotonin production.

Smoking Cessation: L-Tryptophan is sometimes used to aid in smoking cessation, although evidence supporting its effectiveness is lacking.



As with most supplements, the dosage you take will be determined by your specific purpose or condition. For this reason it is advised to consult with your doctor or qualified medical professional before beginning use.

Some sources indicate that the most commonly used dosage range is between 6 and 12 grams.

Most adults (especially those who are looking to reduce symptoms of depression) will take Tryptophan supplements in 3 or 4 equally divided daily administrations to ensure a consistent supply.


Item Specifications Results
Assay(HPLC) 98.0%~102.0% 98.9%
Appearance Off-white powder Complies
Identification IR Complies
Melting point 156.0~160.0℃ 157.0~158.0℃
Loss on drying ≤0.5% 0.11%
Residue on ignition ≤0.1% 0.06%
Related substance ≤1.0% 0.75%
Heavy metals ≤10ppm Complies

Packaging 1kg-15kg packing 2 PE bag inside + 1 foil bag outside in carton
25kg-50kg packing 2 PE bag inside + 1 foil bag outside in drum
Other packing Customized packing
Drum Size D38cm*H60cm or customized, 25 kg/ drum
Shipping 1-50kg International Express Fast and convenient Door to Door
50-500kg Air Transportation Fast and cheap To Air Port
Above 500kg Sea Transportation Cheap and convenient To Port


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