The structural protein of silk, listed as a bulking ingredient.
What it is
Fibroin is the fibrous protein that forms the core of silk filaments produced by the silkworm, Bombyx mori. CosIng lists it as a bulking ingredient.
Where it is used
Appears on the ingredient lists of a small number of products.
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.
Fibroin is of animal origin. The INCI name does not show whether it was used as a powder, solution or in another form.
Functions
- Bulking
- Non-reactive (chemically inert), solid ingredients that dilute other solids and/or increase the volume of cosmetic products.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.