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L-cysteine is a semi-essential amino acid found naturally in the human body, abundant in protein-rich foods.

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L-cysteine is used therapeutically and nutritionally to improve the health of humans. It’s a basic building block of glutathione, and also valued for its ability to break up mucus, thereby making it easier to cough up phlegm that’s caused by respiratory and pulmonary conditions.


1.Has antioxidant properties

2.Promotes detoxification

3.Increases male fertility

4.Balances blood sugar levels

5.Support digestive health

6.Relieves symptoms of respiratory conditions

7.Helps treat psychiatric disorders

Some Application

Many high-protein foods contain L-cysteine, although usually in small amounts. These foods include:chicken, turkey, duck, pork, yogurt, cheese, eggs, sunflower seeds, etc .


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Xi’an SR Bio-Engineering Co., Ltd

Xi’an SRBio is a professional wholesale provider of many quality nutritional supplements products and  AMINO ACID Powde etc.

We supply powder, tablets and capsules.

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