• Strengthens and smooths hair cuticle
• Enhances skin softness and hydration
• Adds a silky texture to formulas
• Film-forming with moisture retention benefits
• Soluble in water and easy to use in emulsions

Silk Protein (usually in hydrolyzed form) is derived from the natural silk fiber and contains small molecular peptides and amino acids. It acts as a moisture-binding protein that penetrates the hair shaft and upper skin layers to provide strength, shine, elasticity, and smoothness. In haircare, it helps repair damaged strands, reduce frizz, and improve manageability. In skincare, it offers a silky, luxurious feel and reduces dryness and irritation. Bio Shop™ Silk Protein is water-soluble and ideal for use in emulsions, water-based formulas, and rinse-off products.

INCI Name: Hydrolyzed Silk

CAS Number: 96690-41-4

Solubility: Water-soluble

Add Phase: Cool-down phase (below 45°C)

pH Stability: 4.5 – 7.5

Processing Temperature: Below 45°C

Appearance: Clear to amber liquid or fine powder (depends on form)

Odor: Mild protein-like scent

Molecular Weight: Low (300–800 Da)

Flash Point: Not flammable

Density: ~1.05 g/cm³ (liquid)

• Usage Rate: 0.5% – 5%
• Add during cool-down phase
• Ideal for: Shampoos, Conditioners, Serums, Lotions, Creams, Hair Masks

✨ Add 2% Silk Protein to your shampoo or leave-in conditioner for smoother, shinier, frizz-free hair without heaviness. Also great in facial creams for a soft-focus feel!

✔️ Safe for all skin and hair types

✔️ Especially beneficial for dry, damaged, and aging skin or brittle hair

1. Repairing Hair Conditioner

Blend Silk Protein with panthenol, cetyl alcohol, and argan oil for a silky conditioner that reduces breakage and improves combability.

2. Anti-Frizz Hair Serum

Create a light silicone-free serum using Silk Protein, glycerin, and a water-based gel to add shine and smooth flyaways.

3. Moisturizing Face Cream

Use Silk Protein in an emulsion with shea butter and hyaluronic acid for deep hydration and a luxurious afterfeel.

4. Skin-Smoothing Body Lotion

Formulate a fast-absorbing lotion with Silk Protein, aloe vera, and Vitamin E for post-shower skin softness.

5. Strengthening Hair Mask

Add to a thick conditioning mask with coconut oil, honey, and cationic emulsifiers for deep repair and bounce.

Rated based on compatibility, conditioning performance, and cosmetic use versatility.

Serums
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜ – Enhances slip and smoothness in water-based serums.



Creams & Lotions
⭐⭐⭐⭐⭐ – Excellent
🟩🟩🟩🟩🟩 – Improves skin texture and feel in emulsified products.



Toners
⭐⭐⭐☆☆ – Moderate
🟧🟧🟧⬜⬜ – Adds softness and hydration in watery mists.



Face Masks
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜ – Provides skin-soothing and film-forming effects.



Cleansers
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜ – Boosts mildness and after feel in foaming cleansers.



Hair Masks
⭐⭐⭐⭐⭐ – Excellent
🟩🟩🟩🟩🟩 – Repairs, smooths, and strengthens damaged hair.



Deodorants
⭐⭐☆☆☆ – Fair
🟧🟧⬜⬜⬜ – May provide a skin-conditioning touch in cream deodorants.



Eye Creams
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜ – Softens fine lines and improves texture around eyes.



Shampoos
⭐⭐⭐⭐⭐ – Excellent
🟩🟩🟩🟩🟩 – Adds softness, strength, and manageability.



Soaps
⭐⭐☆☆☆ – Fair
🟧🟧⬜⬜⬜ – Limited use; may degrade in high pH soaps.



Conditioners
⭐⭐⭐⭐⭐ – Excellent
🟩🟩🟩🟩🟩 – Outstanding for detangling and shine enhancement.



Lip Balms
⭐☆☆☆☆ – Poor
🟥⬜⬜⬜⬜ – Not suitable for oil-based, anhydrous systems.



Body Butters
⭐⭐☆☆☆ – Fair
🟧🟧⬜⬜⬜ – Can be used in emulsified butters; not oil-only formulas.

Q1: Is Silk Protein safe for daily use?

A1: Yes! It is gentle, lightweight, and can be used daily in both skincare and haircare products.

Q2: Can it be used in leave-in and rinse-off products?

A2: Absolutely. Silk Protein performs well in both types of formulas, improving moisture retention and feel.

Q3: Will it make hair greasy or heavy?

A3: No, when used at 0.5–2%, it penetrates the hair shaft without buildup.

Q4: Is Silk Protein vegan?

A4: No. It is derived from silkworm cocoons. For vegan alternatives, consider Rice Protein or Soy Protein.