What Is C9-11 Alketh-6?
C9-11 Alketh-6 is a synthetic non ionic surfactant created by attaching an average of six ethylene oxide units to a blend of fatty alcohols containing nine to eleven carbon atoms. Formerly called C9-11 Pareth-6, it belongs to the larger family of polyethylene glycol ethers used to mix oil and water in cosmetic formulas. Production starts with laboratory made C9-11 fatty alcohols that are reacted with ethylene oxide in a controlled process known as ethoxylation. This stepwise addition of ethylene oxide yields a clear to pale yellow liquid that readily dissolves in both water and oils.
The ingredient gained popularity in the late 1970s when formulators sought reliable alternatives to natural soap-based emulsifiers that could perform in a wider pH range. Its consistent quality and mildness soon made it a staple in personal care. Today you will most often find C9-11 Alketh-6 in facial cleansers, moisturizers, lotions, masks, serums, sunscreens, hair conditioners and rinse-off treatments where a smooth, uniform texture is essential.
C9-11 Alketh-6’s Cosmetic Benefits/Uses
In skin and hair care C9-11 Alketh-6 serves a single yet vital role.
As an emulsifying agent it binds oil and water into a stable mixture so creams do not separate on the shelf or during use. This stability helps products feel lighter, spread more evenly and deliver active ingredients uniformly across the skin or hair. Its non ionic nature also makes it compatible with a wide range of other ingredients, allowing formulators to craft clear or opaque products without affecting fragrance, color or performance.
Who Can Use C9-11 Alketh-6
C9-11 Alketh-6 is generally considered suitable for most skin types including normal, oily, combination and even sensitive skin because it is a mild non ionic emulsifier that is used at low concentrations. Those with very reactive or compromised skin should still monitor for any signs of irritation, as they would with any new cosmetic ingredient.
The compound is fully synthetic and does not rely on animal derived raw materials, so products using C9-11 Alketh-6 are typically appropriate for vegetarians and vegans. If a formula is marketed as vegan it is still wise to confirm that all other ingredients share the same status.
No published data link topical C9-11 Alketh-6 to risks during pregnancy or breastfeeding. This does not constitute medical advice and pregnant or nursing individuals should always discuss any skincare routine with a qualified healthcare provider before use.
The ingredient is not known to cause photosensitivity, meaning it does not make skin more likely to burn in the sun. Standard sun protection practices are still encouraged for overall skin health.
Potential Side Effects/Adverse Reactions
Side effects from topical C9-11 Alketh-6 vary from person to person. The points below outline potential reactions only. When used correctly in a well formulated product most people will not experience any negative effects.
• Mild skin irritation such as redness or stinging
• Itching or a sensation of tightness, especially on very dry skin
• Contact dermatitis in individuals with an allergy or heightened sensitivity to polyethylene glycol derivatives
• Eye irritation if the product accidentally enters the eyes
If any discomfort or visible reaction occurs stop using the product and seek advice from a medical professional or dermatologist.
Comedogenic Rating
Rating: 1 / 5
C9-11 Alketh-6 is a water soluble non ionic surfactant with a relatively low molecular weight and no heavy oily residue. Its structure is designed to sit at the oil-water interface then rinse or absorb away rather than linger inside pores. Because of this it carries only a minimal chance of clogging follicles, so formulators generally regard it as low comedogenic.
Most people prone to acne or breakouts should find products containing C9-11 Alketh-6 acceptable, though overall formula design matters more than any single ingredient.
No data suggest it exacerbates fungal acne and it is often used in light gel cleansers or lotions specifically aimed at blemish prone skin.
Summary
C9-11 Alketh-6 is primarily an emulsifier that keeps oil and water smoothly blended in creams, lotions, cleansers and hair care. Its fatty alcohol tail anchors into oils while its ethylene oxide portion attracts water, creating a stable interface that stops products from separating and helps active ingredients spread evenly.
Behind the scenes it is a quiet workhorse rather than a headline star. Chemists value its reliability, mildness and flexibility so it appears in many everyday formulas even though consumers may not recognize the name.
The ingredient is considered low risk for irritation or pore clogging when used at typical levels. That said every skin type is unique so it is always wise to patch test a new product before adding it to a routine.