What Is Peg-1182 Methyl Ester Sericin?
Peg-1182 Methyl Ester Sericin is a water-soluble form of sericin, the natural protein that coats silk fibers in a silkworm cocoon. To create this ingredient, raw sericin is first isolated from silk waste, then converted to a methyl ester and linked with about 1,182 units of ethylene oxide. This process, called ethoxylation, gives the protein a soft creamy texture and allows it to blend easily with water-based formulas. Sericin has long been valued in traditional beauty rituals for leaving skin feeling smooth; modern chemists refined it into this pegylated version in the early 2000s to improve stability and compatibility with other cosmetic ingredients. You will most often find Peg-1182 Methyl Ester Sericin in lightweight moisturizers, hydrating masks, anti-aging serums and soothing after-sun gels where a gentle skin-conditioning boost is desired.
Peg-1182 Methyl Ester Sericin’s Cosmetic Benefits/Uses
In skin care formulas Peg-1182 Methyl Ester Sericin serves one main purpose: skin conditioning. By forming a delicate film on the surface of the skin it helps hold moisture, leaving the complexion feeling softer and looking smoother. The silky finish can also give a product a pleasant slip, making creams or gels spread more evenly during application.
Who Can Use Peg-1182 Methyl Ester Sericin
Peg-1182 Methyl Ester Sericin is generally well tolerated by all skin types. Dry and sensitive complexions appreciate its water-binding film while normal and combination skin enjoy the soft slip it provides. Very oily or acne-prone skin can still use it since the molecule is lightweight and water soluble but those users may prefer formulas where it is not the primary hydrator.
The ingredient is sourced from silk cocoons so it is not considered vegan. Some vegetarians also avoid insect-derived materials for ethical reasons so they may choose alternatives produced from plant proteins instead.
No specific data flag this ingredient as unsafe for pregnant or breastfeeding women when used in standard topical amounts. That said this is not medical advice and anyone who is expecting or nursing should review any new skincare product with a qualified doctor to be certain it fits their personal health needs.
Peg-1182 Methyl Ester Sericin does not increase photosensitivity so it will not make skin more prone to sunburn. It is also compatible with common actives like niacinamide retinol and vitamin C so layering concerns are minimal.
Potential Side Effects/Adverse Reactions
Side effects vary from person to person. The following list covers potential reactions yet most users experience none of them when the ingredient is properly formulated and used as directed.
- Mild redness or stinging in very sensitive skin
- Itchiness or small hives in individuals allergic to silk proteins
- Transient tight feel if applied in a high concentration without additional emollients
- Watery eyes if the product accidentally gets too close to the lash line
If you notice irritation or any persistent discomfort stop using the product and seek advice from a healthcare professional.
Comedogenic Rating
Rating: 0 / 5
Peg-1182 Methyl Ester Sericin is fully water soluble and lacks oily or waxy components that could clog pores, so it earns a 0. Its lightweight protein-based structure rinses away cleanly and does not build up inside follicles.
This makes the ingredient suitable for people who are prone to acne or frequent breakouts. Because it is typically used at modest levels and sits on the surface in a breathable film, it is unlikely to trigger new blemishes.
No published data suggest that it aggravates fungal acne and it can be paired with common acne treatments without interference.
Summary
Peg-1182 Methyl Ester Sericin is a water soluble silk-derived protein that conditions skin by forming a thin moisture-holding film and giving products a smooth slip. It is mainly included to boost softness, improve spreadability and leave a light silky finish.
While it is not a household name like hyaluronic acid or glycerin, formulators appreciate its pleasant feel so it appears in a growing number of gels masks and lotions aimed at hydration and soothing.
Current research and market experience show it to be low risk, with only rare reactions in people sensitive to silk proteins. As with any new cosmetic we recommend a quick patch test to confirm personal compatibility before full use.