Hydrolyzed Keratin Protein

About Hydrolyzed Keratin Protein

Hydrolyzed Keratin Protein is a widely used cosmetic ingredient derived from keratin (the natural protein found in hair, skin, and nails). Through hydrolysis, keratin is broken down into smaller molecules (peptides and amino acids), making it easier to absorb and more effective in beauty formulations.

What it does in cosmetics

1. Hair care (most common use)

• Repairs damage: Fills in gaps in the hair cuticle caused by heat, coloring, or chemical treatments
• Strengthens hair: Improves elasticity and reduces breakage
• Adds shine & smoothness: Makes hair softer and more manageable
• Reduces frizz: Forms a protective film over hair strands

Found in shampoos, conditioners, hair masks, serums, and treatments

2. Skin care

• Moisturizing: Acts as a humectant (helps retain water)
• Improves texture: Leaves skin feeling smooth and soft
• Film-forming: Creates a light barrier to prevent moisture loss

Used in creams, lotions, serums

3. Nail care

• Helps strengthen brittle nails
• Improves nail flexibility

Found in nail treatments and strengthening formulas

Why hydrolyzed form matters

Regular keratin molecules are too large to penetrate effectively. Hydrolysis breaks them down into:

• Low molecular weight peptides
• Better penetration and binding to hair/skin

Typical formulation details

• INCI name: Hydrolyzed Keratin
• Appearance: Clear to amber liquid or powder
• Usage level:
  • Hair care: 0.5% 5%
  • Skin care: 0.1% 2%
• Solubility: Water-soluble
• pH range: Usually stable in pH 47

Things to keep in mind

• Overuse (especially in hair) can lead to protein overload, making hair stiff or brittle
• Often derived from:
  • Wool (sheep)
  • Feathers
  • Horns/hooves
    May not be vegan unless specified as plant-derived alternative

Alternatives (vegan-friendly)

• Hydrolyzed wheat protein
• Hydrolyzed soy protein
• Hydrolyzed rice protein