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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-Cysteine is a non-essential amino acid synthesized from cysteine and glycine through a reaction catalyzed by cystine synthase. It has important physiological functions in living organisms.

Cystine plays an important role in protein structure. It contains sulfur atoms, which can form disulfide bonds and participate in protein stability and folding. In addition, cystine is also a component of glutathione, an important antioxidant that can scavenge free radicals and protect cells from oxidative damage.

Cystine is also involved in some important metabolic processes in the body. It is an intermediate product of methionine metabolism and can be converted into alanine (Homocysteine) and then further converted into cysteine. These metabolites participate in important biochemical processes such as methylation reactions and sulfur metabolism in the body.

In addition, cystine also has a detoxifying effect and can combine with some toxic substances to reduce their damage to the body.

In short, cystine has a variety of important physiological functions in organisms, including protein structure stabilization, antioxidant, metabolic regulation, and detoxification.

Product Specifications

L-Cystine 99%

Certificate of Analysis


Cysteine is a non essential amino acid that has multiple important physiological functions in the human body.
Antioxidant effect: Cysteine is one of the important antioxidants in the body, which can neutralize free radicals, reduce the damage of oxidative stress to cells, and protect cells from oxidative damage.
Detoxification effect: Cysteine can combine with certain toxic substances to form non-toxic compounds, thereby playing a detoxifying role.
Immunomodulatory effect: Cysteine can regulate the function of the immune system, promote the proliferation and activation of lymphocytes, and enhance the body’s immune system.
Maintaining liver health: Cysteine can promote the metabolism and excretion of liver endotoxins, protecting liver health.
Promoting collagen synthesis: Cysteine is an important raw material for synthesizing collagen, which can promote collagen synthesis and maintain the health of tissues such as skin, bones, and joints.
Promoting muscle growth: Cysteine can promote the synthesis of muscle proteins, increase muscle mass and strength.
In summary, cysteine has multiple important physiological functions in the human body, playing an important role in protecting cells, regulating the immune system, maintaining liver health, promoting collagen synthesis, and muscle growth.

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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