Executive Summary
Silk peptide, the hydrolysate of silk protein derived from cocoons 3 Nov 2025—Hydrolyzed keratin is a mix of peptides and amino acidsobtained from the controlled bio- or chemical hydrolysis of proteins from natural origin
The term hydrolyzed silk peptides INCI refers to a highly prized ingredient used extensively in the personal care and cosmetics industry. Derived from natural silk fibers, these peptides offer a remarkable array of benefits for both skin and hair. Understanding the INCI (International Nomenclature of Cosmetic Ingredients) name, Hydrolyzed Silk, and its properties is key to appreciating its efficacy and widespread use.
What are Hydrolyzed Silk Peptides?
At its core, hydrolyzed silk is a protein derived from the cocoons of the silk worm, primarily the *Bombyx mori* species. The process of hydrolysis breaks down the large silk protein molecules (like fibroin) into smaller, more easily absorbable fragments – the peptides and amino acids. This breakdown can be achieved through various methods, including enzymatic, chemical, or acid hydrolysis. The resulting hydrolyzed silk protein is a light, fine powder or a liquid solution, often appearing as Water, Hydrolyzed Silk when listed in product formulations.
The INCI Name and Its Significance
The INCI name for this ingredient is consistently Hydrolyzed Silk. This standardized naming convention ensures clarity and consistency for consumers and manufacturers worldwide. While other related terms like Silk Amino Acids, Silk Extract, and Silk Peptide may appear, Hydrolyzed Silk is the most common and accepted INCI designation for the hydrolyzed form. It's important to note that hydrolyzed silk is not a vegan ingredient, as it originates from silkworms; therefore, those seeking hydrolyzed silk vegan alternatives would need to look for plant-based protein derivatives.
Key Properties and Functions of Hydrolyzed Silk
The benefits of hydrolyzed silk peptides stem from their unique molecular structure and composition. These protein fragments from silk possess several beneficial properties:
* Skin Conditioning and Hydration: Hydrolyzed Silk acts as an excellent humectant, meaning it attracts and retains moisture. This property helps to deeply hydrate the skin, leaving it feeling plump, supple, and smooth. It can improve skin texture and elasticity, contributing to a more youthful appearance. Fibroin helps in calming inflamed skin by increasing cell metabolism and boosting blood circulation, which can reduce redness and irritation. This calming effect is a significant advantage for sensitive skin types.
* Hair Conditioning and Shine: In hair care, hydrolyzed silk protein is renowned for its conditioning abilities. It can smooth the hair cuticle, reduce static electricity (antistatic properties), and impart a healthy shine. This leads to softer, more manageable hair that is less prone to frizz.
* Antistatic Properties: As mentioned, hydrolyzed silk helps to neutralize electrical charges on surfaces, making it effective in reducing static in both hair and fabrics.
* Improving Elasticity: The amino acid profile of hydrolyzed silk contributes to improving the skin's natural elasticity, making it appear firmer and more resilient.
Applications in Cosmetics and Personal Care
You'll find Products with Hydrolyzed Silk Protein across a wide spectrum of cosmetic and personal care items. Some common examples include:
* Moisturizing serums and lotions
* Shampoos and conditioners
* Hair masks and treatments
* Facial cleansers
* Anti-aging creams
* Silk Peptide Powder formulations
The versatility of hydrolyzed silk allows it to be incorporated into various product types, enhancing their performance and sensory experience.
Understanding Related Terms and Concepts
* Silk Peptide: This term often refers to the smaller fragments obtained from the hydrolysis of silk protein. Silk Peptide can be used interchangeably with hydrolyzed silk peptides in many contexts.
* Hydrolyzed Keratin: While also a protein derivative used in cosmetics, hydrolyzed keratin is a mix of peptides and amino acids obtained from the controlled bio- or chemical hydrolysis of proteins from natural origin, typically from sources like feathers or wool, and differs from silk-derived proteins.
* SERICIN: Sericin is another protein found in silk, often removed during the processing of silk fibroin. While hydrolyzed sericin is also used in cosmetics, hydrolyzed silk typically refers to the hydrolysis of fibroin.
* SILK PEP®: This is a registered trademark for a specific active ingredient composed of peptides obtained from the partial hydrolysis of natural silk Fibroin.
Safety and Efficacy
The safety of silk proteins as cosmetic ingredients has been assessed, and they are generally considered safe for use. Hydrolyzed Silk Peptide has a low concern profile regarding allergies, immunotoxicity, and reproductive toxicity according to resources like EWG Skin Deep. The hydrolysis process makes these proteins more bioavailable, allowing them to penetrate the skin and hair more effectively. The **silk peptide, the hydrolysate of silk protein derived from cocoons,
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