Question 1

What does Keratin do in a cosmetic formula?

Accepted Answer

This ingredient is primarily a conditioning and film-forming material for hair, nails, and skin. It deposits a thin proteinaceous layer that can improve feel, reduce combing friction, and temporarily support a smoother surface.

Question 2

Is Keratin clean?

Accepted Answer

From a clean-beauty perspective, it is generally well tolerated and not a common restricted-list issue. The main considerations are animal sourcing, processing method, and residual impurities from extraction or solubilization.

Question 3

Is Keratin sustainable?

Accepted Answer

This material is usually sourced from animal byproducts such as wool, feathers, or hooves, so traceability and welfare standards matter. It is biodegradable as a protein, but its sustainability profile depends on the feedstock and processing chemistry used to make it usable in formulas.

Question 4

Is Keratin COSMOS-approved?

Accepted Answer

It can be compatible with COSMOS-natural standards when sourced and processed according to the standard, especially when derived from acceptable animal byproducts and made with permitted processes. Its Green Chemistry fit is moderate, since it is biodegradable and often uses byproduct streams, but extraction and solubilization can involve more intensive chemical processing.

Question 5

How does Keratin work chemically?

Accepted Answer

This compound is a fibrous, sulfur-rich structural protein with many cystine disulfide linkages, which gives it strength but also makes the native material poorly soluble in water. In personal care, it is commonly used in processed, more dispersible forms at roughly 0.1% to 5%, with performance influenced by molecular weight, pH, and compatibility with surfactants and conditioning polymers.