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Address: Rm 218, Tangxing Digital Bld, #6 Tangxing Rd, Xi’an, Shaanxi, China
Phone: +86 17791258855
Landline: +86 (0)29 81870046


Other Name





white crystal powder


Customized various dosage forms and packaging


HACCP, ISO22000, ISO9001, EU Organic, US Organic, HALAL, KOSHER




Product Description

L-Tryptophan is an essential amino acid. Amino acids are the molecules that our bodies use to build proteins and perform other essential functions in the body. An essential amino acid is especially important because it cannot be produced by our bodies, so it must be obtained through our diet.

Product Specifications

L-Tryptophan 99%

Certificate of Analysis


L-Tryptophan is an important amino acid that has multiple effects in the human body:Improving mood: Serotonin is a neurotransmitter that can enhance mood, and the intake of L-Tryptophan can increase the synthesis of serotonin, thereby improving mood, reducing anxiety and depression.
Improving sleep quality: Tryptophan can regulate sleep by synthesizing melatonin, a hormone that regulates the biological clock and helps people fall asleep and maintain good sleep quality.
Promoting growth and development: Tryptophan is an important component of synthetic proteins and plays a crucial role in human growth and development.
Enhancing immunity: Tryptophan can promote the proliferation and function of immune cells, enhance the body’s immunity, and is of great significance in preventing infections and diseases.
In summary, tryptophan has multiple important physiological functions in the human body, playing an important role in maintaining physical health and promoting mental health.

Application Cases

Why RainWoodBiotech?

RainWood Biotech is engaged in researching, producing, and exporting concerning the field of health and fitness, cosmetics, pharmaceuticals, food, and beverages additives, and also feeding staff who have obtained EU and US organic certification, KOSHER, HALAL, ISO9001, HACCP, and ISO22000.
RainWood Biotech was established in 2006, located in Shaanxi Xi’an Hi-tech Development Zone, covering 19 acres of land with a factory construction area of around 10000 square meters.

RainWood Biotech believes that natural specialty ingredients and innovative technology are the best basis for us to serve our clients’ needs. We are capable and proud to provide the greatest product solutions to increase more value of the products themselves.

Frequently Asked Questions

Rainwood provides herbal extract, cosmetic ingredient and food additive product.

Our company has its own competitive R&D team, and currently owns more than 100 employees. Among them, there are 3 Dr. doctors majored in this field. Besides, Postgraduate employee accounts 10%, undergraduate employee accounts 15%, and professional technical personnel accounts 5%. Its professional talented personnel are completely equipped in laboratory for the quality control.
Various Detection Devices are well equipped, such as HPLC, GC, UV, TLC, Spectrophotometer, AAS, Polarimeter, Auto titrators, BOD Incubators, COD Incubators, Melting point apparatus and so on.
The entire production process from the source of raw material, production, inspection, warehousing, customer service and other sectors are in strict accordance with the ISO9001:2015 system.
We will provide you with satisfactory products according to your requirements.

Please contact our sales person and they will guide you with an easy and professional way for your order.

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We will contact you within 1 working day, please pay attention to the email with the suffix “”.