Hydrolyzed Silk

silk uh-MEE-noh AS-ids

INCI: Silk Amino Acids

Conditioning Agent, Humectant, Protein 8/10 Safety CG ApprovedClean Natural Not Vegan

What Is Hydrolyzed Silk?

Silk Amino Acids are derived from hydrolyzed silk (fibroin or sericin proteins from silkworm cocoons). These small amino acid and peptide fragments have excellent moisture-binding properties and can penetrate the hair shaft to strengthen and add a signature silky feel. Silk has been used in hair care across Asian cultures for centuries.

Source: Silkworm (Bombyx mori) cocoons

Origin: Natural

Also known as: Silk Protein, Hydrolyzed Silk, Silk Peptides, Sericin

What Does Hydrolyzed Silk Do to Your Hair?

Silk Amino Acids penetrate into the hair cortex due to their small molecular size, binding to keratin proteins and improving hair strength and elasticity. They form a transparent film on the hair surface that enhances shine and provides a characteristically smooth, silky texture. They also attract and retain moisture, improving the hair's moisture balance.

Best For

All hair types, damaged hair, dull hair, color-treated hair, fine hair, dry hair

Not Recommended For

Not significantly problematic for any hair type; not vegan

Concentration Matters

0.1-5%

Hair Type Compatibility

1A Straight Fine
1B Straight Medium
1C Straight Coarse
2A Wavy Fine
2B Wavy Medium
2C Wavy Coarse
3A Curly Loose
3B Curly Tight
3C Curly Corkscrew
4A Coily S-Shaped
4B Coily Z-Shaped
4C Coily Tight
Color-treated: Safe Heat-damaged: Beneficial

Method Compatibility

Curly Girl (CG) Method: Approved
CG Approved
LOC Method

Safety & Regulation

8/10
AvoidCautionSafe

Very safe for topical use. Non-irritating and non-sensitizing. Sericin (silk gum) protein may occasionally cause irritation in very sensitive individuals, though this is rare. Not suitable for those seeking vegan or cruelty-free products.

FDA Status: Generally Recognized As Safe

FDA permits use in cosmetics without restrictions. Widely used in Asian beauty products with long safety history.

EWG Score: 1/10

HairAide Verdict

Silk Amino Acids are one of the best ingredients for adding genuine shine and silky smoothness to hair. They provide lightweight protein strengthening without the risk of protein overload. HairAide recommends them especially for dull, lackluster hair that needs a visible boost in shine and softness.

Products That Contain Hydrolyzed Silk

Conditioners, hair masks, shine serums, styling products, leave-in treatments

Alternatives to Hydrolyzed Silk

If you want to avoid Hydrolyzed Silk, look for products with these ingredients instead:

Hydrolyzed Wheat Protein, Hydrolyzed Rice Protein, Keratin, Oat Amino Acids

Frequently Asked Questions

Is Hydrolyzed Silk safe for hair?

Yes, Hydrolyzed Silk has a safety rating of 8/10 and is generally considered safe for use in hair products. Very safe for topical use. Non-irritating and non-sensitizing. Sericin (silk gum) protein may occasionally cause irritation in very sensitive individuals, though this is rare. Not suitable for those seeking vegan or cruelty-free products.

Is Hydrolyzed Silk bad for curly hair?

Hydrolyzed Silk is CG-method approved and is generally considered safe for curly hair.

Is Hydrolyzed Silk CG-method approved?

Yes, Hydrolyzed Silk is approved for the Curly Girl method.

What can I use instead of Hydrolyzed Silk?

Some alternatives to Hydrolyzed Silk include: Hydrolyzed Wheat Protein, Hydrolyzed Rice Protein, Keratin, Oat Amino Acids

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