Fibroin
What is Fibroin?
Fibroin is a natural fibrous protein extracted from the cocoons of the silkworm Bombyx mori, primarily composed of glycine, alanine, and serine amino acids. In cosmetics, it belongs to the category of conditioning and film-forming agents. It functions by creating a lightweight, breathable layer on the skin's surface that helps retain moisture and enhances product texture. As a bulking agent, it adds volume to formulations, improving spreadability and feel without overpowering active ingredients. Its biocompatibility stems from its protein structure, similar to human keratin, allowing it to adhere gently and support hydration. Commonly found in creams, serums, and masks, fibroin contributes to smoother application and a silky finish in skincare products.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Provides moisturizing effects by forming a hydrating film.
Acts as a bulking agent to enhance product texture and spread.
Supports skin conditioning for improved feel.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| People with dry skin seeking hydration support. | Individuals with known silk protein allergies. |
| Those preferring natural protein-based ingredients. | Those sensitive to insect-derived materials. |
| Users looking for lightweight film-forming options. | People with specific protein sensitivities. |
Safety Notes
- Rated low hazard by EWG with minimal concerns.
- Non-comedogenic, unlikely to clog pores.
Frequently Asked Questions about Fibroin
What is fibroin derived from?
It is a protein obtained from silkworm cocoons.
Is fibroin safe for daily use?
It carries a low safety rating from authoritative databases.
Does fibroin help with dryness?
It supports moisturizing through film-forming action.