Bombyx Mori Extract: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 23, 2025
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All information on this page is verified using The Personal Care Products Council's (PCPC) INCI database. Our ingredient analyses are based exclusively on PCPC's technical data to ensure accuracy and reliability.

What Is Bombyx Mori Extract?

Bombyx Mori Extract comes from silkworms, the same insects that spin the silk threads used in textiles. Producers collect the larvae, crush them and then process the material with water or gentle solvents to pull out skin-friendly components. The resulting liquid is rich in silk proteins such as fibroin and sericin along with assorted amino acids, minerals and trace vitamins. Silk has been prized for thousands of years, and its smooth touch inspired early cosmetic makers in Asia to test silk proteins on skin. Over time this trial-and-error approach showed that silkworm extracts could soften and moisturize, leading to their inclusion in modern skincare. Today the purified extract is filtered, concentrated and preserved for stability before being added to face masks, anti-aging serums, daily moisturizers, eye creams and occasional leave-on treatments that aim to boost softness and radiance.

Bombyx Mori Extract’s Cosmetic Benefits/Uses

In beauty formulas Bombyx Mori Extract is valued mainly for its ability to condition the skin.

As a skin-conditioning agent it helps bind water to the surface of the skin, leaving it feeling smoother and more supple. The silk proteins create a light breathable film that can reduce dryness, support the natural barrier and give a subtle silky finish. Regular use may improve the look of rough patches and fine lines while adding a luxurious texture to the product itself.

Who Can Use Bombyx Mori Extract

Bombyx Mori Extract is generally well tolerated by all major skin types. Normal and dry complexions tend to appreciate its moisture binding properties while combination and oily skin can still enjoy the light breathable film it forms without an overly greasy feel. Extremely sensitive skin or anyone with known allergies to silk, moths or related insect proteins should approach with caution because the extract is animal derived.

The ingredient is not suitable for vegans or strict vegetarians since it comes from crushed silkworms. Those who avoid animal sourced ingredients on ethical or religious grounds will want to choose plant based alternatives.

No specific warnings exist for pregnant or breastfeeding women regarding topical use of Bombyx Mori Extract. That said this is not medical advice and anyone expecting or nursing should show any new skincare product to a qualified health professional just to be safe.

Bombyx Mori Extract is not known to increase photosensitivity so daytime use does not require extra sun precautions beyond a standard broad spectrum sunscreen.

Potential Side Effects/Adverse Reactions

Responses to topical Bombyx Mori Extract differ from person to person. The points below cover possible but uncommon reactions. When the ingredient is formulated and preserved correctly most users will not notice any problems.

  • Allergic response – individuals sensitive to silk or insect proteins may experience redness itching or swelling
  • Mild irritation – very reactive skin might feel stinging or develop slight dryness if the formula has a high extract concentration
  • Breakouts – the light film of silk proteins could trap oil and lead to clogged pores in a small number of acne prone users
  • Contact dermatitis – rare inflammatory rash can occur if the immune system misreads the proteins as a threat

If any negative reaction appears stop using the product immediately and seek advice from a healthcare professional.

Comedogenic Rating

Bombyx Mori Extract carries a comedogenic rating of 1 out of 5. The silk proteins create a thin breathable film that rarely blocks pores, and the extract itself is water based rather than oily. While a small subset of very acne prone users might notice congestion if the product is heavily layered with other occlusives, the ingredient on its own is unlikely to trigger widespread breakouts. In short it is generally considered suitable for people who are prone to acne, though individual experiences can differ. Formulation still matters, so pay attention to the overall product texture and any additional pore-clogging additives that may be present.

Summary

Bombyx Mori Extract is chiefly a skin-conditioning agent that boosts moisture retention, smooths rough patches and leaves a soft silky finish. It achieves these effects by laying down a micro-thin protein film that binds water and supports the skin barrier, helping the face feel supple and look more radiant.

The ingredient enjoys modest popularity, appearing most often in Asian beauty products and select niche formulations rather than in every drugstore cream. Its gentle nature keeps it on the radar for brands aiming to offer a luxurious texture without heavy oils.

Overall safety is high with low rates of irritation or allergy in the general public. Because sensitivities can never be ruled out, it is wise to perform a quick patch test whenever you introduce a new product that contains Bombyx Mori Extract.

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