Bombyx Mori Extract is a protein-dense derivative of silkworm cocoons, valued for its exceptional moisture-binding and film-forming capabilities. It utilizes a high concentration of silk proteins to smooth skin texture and reinforce the moisture barrier against environmental stressors.
- INCI Name:
- Bombyx Mori Extract
- Chemical/Scientific Name:
- Bombyx Mori (Silk) Chrysalis/Cocoon Extract
- Common Aliases:
- Silk Extract, Silkworm Extract, Hydrolyzed Silk, Sericin, Fibroin
| Category: | Active Substances |
| Source Origin: | Animal (Silkworm cocoons) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Dermatology, Textiles, Biomedical Engineering |
| Solubility: | Water-soluble (specifically in hydrolyzed forms) |
At a Glance: Properties & Effects
| Hydration/Moisture: | |
| Texture Enhancement: | |
| Soothing/Calming: | |
| Irritation Risk: |
Primary Benefits:
- Creates a breathable, protective film that reduces trans-epidermal water loss (TEWL).
- Supplies essential Amino Acids like Serine and Glycine to the skin.
- Improves tactile smoothness and provides a “silky” finish to topical formulations.
- Exhibits mild antioxidant activity through its sericin component.
Potential Risks:
- Ethical/vegan concerns due to its animal origin.
- Rare potential for protein-based allergic reactions in hypersensitive individuals.
Biological Action & Cosmetic Profile
Silk proteins found within Bombyx Mori Extract consist primarily of fibroin and sericin. Fibroin provides the structural integrity of the silk thread, while sericin acts as a biological “glue” that holds the fibers together. In cosmetic applications, these proteins are often hydrolyzed to decrease their molecular weight, allowing for better skin affinity. Once applied, the extract functions as a superior humectant, drawing moisture into the stratum corneum and holding it via hydrogen bonding.Structural studies show that the Amino Acids present in this extract closely resemble those found in the human skin’s Natural Moisturizing Factor (NMF). Specifically, Alanine, Glycine, and Serine contribute to the maintenance of skin elasticity. Beyond simple hydration, sericin has demonstrated the ability to promote wound healing and support the proliferation of fibroblasts, which are the cells responsible for producing Collagen.The film-forming nature of Bombyx Mori Extract offers a dual advantage. It visually blurs fine lines by filling in microscopic surface irregularities, and it simultaneously acts as a physical shield against particulate pollution. Unlike occlusive petrolatum, the silk film is semi-permeable, allowing for gas exchange while selectively trapping moisture. This makes it an ideal ingredient for “glass skin” formulations or products designed for post-procedure recovery.
Broader Applications & Origins
Traditional Chinese medicine has utilized silkworm derivatives for centuries, but modern extraction techniques have refined these proteins for high-performance dermatology. The silkworms are typically raised on mulberry leaves, and the cocoons are processed through degumming to isolate specific protein fractions. While the textile industry focuses on the strength of long-strand fibroin, the cosmetic industry prioritizes the biocompatibility and water-retention properties of the extract. In recent years, researchers have also explored the use of silk fibroin as a scaffold for tissue engineering and drug delivery systems due to its low immunogenicity.
Routine Integration
Synergies:
- Humectant Boost: Works synergistically with Glycerin and Sodium Hyaluronate to provide multi-depth hydration.
- Barrier Support: Pairs effectively with Panthenol and Allantoin to soothe irritated or dry skin.
- Anti-Aging: Complements Hydrolyzed Collagen and peptide-based serums to enhance the appearance of skin firmness.
Conflicts:
- No known biochemical conflicts; it is highly stable across a wide pH range and compatible with most active ingredients.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel and various dermatological assessments categorize silk-derived proteins as safe for cosmetic use. Clinical data suggests that Bombyx Mori Extract is non-irritating and non-sensitizing, even at high concentrations. Because it is a protein-based ingredient, it is generally considered non-comedogenic, making it suitable for acne-prone skin types that require hydration without oiliness. Regulatory bodies such as CosIng recognize it as a legitimate skin-conditioning and smoothing agent.
Is Bombyx Mori Extract vegan?
No, this ingredient is derived from the cocoons of the silkworm moth and is therefore an animal-derived product. It is not suitable for vegan formulations.
Can this extract help with skin aging?
While it does not directly “turn back the clock” like a retinoid, it significantly improves the appearance of aging skin by increasing hydration and providing a temporary smoothing effect on fine lines.
Is it suitable for sensitive skin?
Yes, the extract is prized for its biocompatibility and is frequently used in products formulated for sensitive or reactive skin to help strengthen the barrier.