INCI name

CYSTINE

Cystine

An amino acid used for hair conditioning and as a fragrance ingredient.

What it is

Cystine is an amino acid formed by two cysteine molecules joined by a disulfide bridge; it is an important building block of keratin in hair and nails. CosIng lists it as an antistatic, hair-conditioning and fragrance ingredient.

Where it is used

Found in shampoos, conditioners, hair masks and hair serums.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

The INCI name does not reveal whether it was produced by fermentation, hydrolysis or synthesis.

Functions

Antistatic
Preventing and/or reducing static electricity by neutralising electrical charge on surfaces.
Hair conditioning
Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.
Fragrance
Imparting an odour or taste. Creating a perceivable pleasant smell and/or masking a bad smell.

EU regulation

This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

Products with this ingredient (13)

Check a full ingredient list