Luxiface Ingredient Intelligence

Keratin

Keratin proteins are used in hair-care formulas to coat, condition and improve the feel of damaged hair.

Hair & Scalp Evidence: Established

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Ingredient overview

What is Keratin?

Keratin is the fibrous structural protein that makes up much of the hair shaft and nails. Cosmetic products generally use hydrolyzed keratin, in which the large protein has been broken into smaller peptides that can deposit on the hair surface and, depending on molecular size, penetrate damaged areas to some extent.

Hair-care studies show hydrolyzed keratin can form protective films, improve some mechanical properties and reduce moisture loss. These effects are cosmetic conditioning and damage support; topical keratin does not permanently rebuild a living hair follicle or reverse the biological causes of hair loss.

At a glance

Why it is used

Hair conditioningDamage supportSmoothness

Often chosen for

Common concerns

Damaged hairRough hair

Skin types

Hair care

Routine role

Hair conditioningDamage supportProtein treatment

Routine guidance

How to use it

Use keratin shampoos, masks, conditioners and leave-in treatments according to product directions. Protein-rich treatments may be used less frequently if hair begins to feel stiff or coated.

Pairing guidance

Routine compatibility

Keratin hair products can be combined with conditioning oils, silicones, humectants and standard scalp-care ingredients depending on hair needs.

Formula context matters

Good to know

Hydrolyzed keratin supports the existing hair fiber but does not repair the living follicle or treat medical hair loss. Effects vary with peptide size, concentration and the rest of the formula.

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Relevant Luxiface routines

See complete routines where this ingredient fits alongside compatible steps.

Korean Dry and Flaky Scalp Starter Trio¥7,700View routine →

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Ingredient information is educational. Product suitability depends on the complete formulation, concentration, how it is used and your individual skin.

Sources & further reading

These references support the ingredient overview. Performance and suitability still depend on the finished product, concentration and how it is used.