Cysteine hair treatment, often referred to as cysteine hair treatment, is a cosmetic procedure that aims to improve the overall health and appearance of the hair. This treatment involves the use of products containing cysteine, a semi-essential amino acid that plays a significant role in the structure of hair and the formation of keratin, a protein that is a major component of hair fibers.

Cysteine hair treatments are commonly used to help strengthen and repair damaged hair, as well as to improve its texture and overall appearance. These treatments are often marketed as a way to reduce frizz, improve manageability, and add shine to the hair.

During the treatment process, cysteine-containing products are applied to the hair, and sometimes heat is used to help the product penetrate the hair shaft. The treatment can help to restructure and fortify the hair, making it smoother and more manageable. Cysteine-based treatments may also help to replenish the natural cysteine levels in the hair, which can be depleted due to factors such as chemical treatments, heat styling, and environmental damage.