🧪 1. Description
Hydrolyzed keratin liquid is a water-soluble protein derived from keratin (hair, wool, feathers, etc.) that has been broken down into small peptides and amino acids.
Key properties:
- Clear to light amber liquid
- Water-soluble
- Rich in amino acids (especially cysteine)
- Film-forming on hair
What it does:
- Repairs appearance of damaged hair (fills gaps in cuticle)
- Improves strength, elasticity, and smoothness
- Reduces frizz and breakage
- Adds shine and softness
👉 Important: it does NOT permanently rebuild hair, but coats and protects it.
📊 2. Usage Rate (Formulation %)
Typical recommended usage:
- 0.5% – 5% (standard cosmetic range)
General guideline:
| Product Type | Usage % |
|---|---|
| Shampoo | 0.5 – 2% |
| Conditioner | 1 – 3% |
| Hair mask | 2 – 5% |
| Leave-in / serum | 0.5 – 2% |
| Styling products | up to 5% (max typical) |
👉 Overuse can make hair stiff or brittle (protein overload).
⚙️ 3. How to Use (In Formulation)
✔️ Basic rules:
- Add to water phase (it is water-soluble)
- Use at cool-down phase (<40°C) to protect protein
- Works best at pH 4 – 7
🧴 Example (Hair Conditioner Formula)
- Water phase → add hydrolyzed keratin (1–3%)
- Oil phase → emulsifiers + oils
- Cool down → fragrance + preservative
💧 DIY Simple Leave-in Spray
- Distilled water → 95–98%
- Hydrolyzed keratin → 1–2%
- Glycerin → 1–2%
- Preservative → required
Mix and spray on damp hair.
🧑🔬 4. How to Use on Hair (Application)
Method:
- Apply on clean damp hair
- Distribute evenly (spray or cream)
- Leave in OR rinse (depending on product)
- Style as usual
Frequency:
- 1–2 times per week (for damaged hair)
- Less often for healthy hair