An aromatic amino acid used as an antistatic and hair-conditioning ingredient.
What it is
Tryptophan is an aromatic amino acid with an indole ring (2-amino-3-(indol-3-yl)propanoic acid); in its L form it is one of the building blocks of proteins. CosIng lists it as an antistatic, hair-conditioning and fragrance ingredient.
Where it is used
Found in hair care products, creams and 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 CAS numbers given cover both L-tryptophan and the DL form; the label does not show which form is used.
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.