What Is C14-15 Alketh-13?
C14-15 Alketh-13 is a man-made ingredient created by joining a mixture of synthetic fatty alcohols that have 14 to 15 carbon atoms with about 13 units of ethylene oxide. Chemists call this kind of material a polyethylene glycol ether. The fatty alcohol part gives the molecule an oil-loving end while the ethylene oxide part attracts water, a mix that makes it useful for keeping oil and water together.
The ingredient grew popular in the late 20th century when formulators searched for reliable and mild emulsifiers that stayed stable over a wide range of temperatures. By tweaking the length of the alcohol chain and the number of ethylene oxide units, suppliers could offer several Alketh or Pareth grades suited to different product textures. C14-15 Alketh-13 hit the sweet spot for everyday skin and hair products.
Manufacturing starts with petrochemical or plant-based feedstocks that are turned into C14-15 fatty alcohols. These alcohols then react with ethylene oxide gas under controlled heat and pressure until the average chain adds up to 13 units. After purification the clear liquid or soft paste is ready for blending into finished formulas.
You are most likely to find C14-15 Alketh-13 in creams, lotions, liquid foundations, sunscreens, makeup removers, hair conditioners and cleansing balms where a smooth, uniform feel is important.
C14-15 Alketh-13’s Cosmetic Benefits/Uses
C14-15 Alketh-13 acts as an emulsifier. It helps oil-based and water-based ingredients mix evenly so the product stays creamy, stable and pleasant to apply from the first use to the last. This ensures a consistent texture, prevents separation in the jar or bottle and allows active ingredients to spread more evenly across skin or hair.
Who Can Use C14-15 Alketh-13
C14-15 Alketh-13 is generally considered gentle enough for all skin types, including dry, oily, combination and sensitive skin. Because it stays mostly on the surface and functions as a helper rather than a high-dose active, it rarely causes problems on its own. People with a known sensitivity to polyethylene glycols or fatty alcohols may still want to avoid it, as they could react even to mild grades.
The ingredient is produced from synthetic or plant-based raw materials and contains no animal-derived substances, so it is normally suitable for both vegans and vegetarians. Certifications can vary by brand, so strict lifestyle users may wish to verify sourcing with the manufacturer.
C14-15 Alketh-13 has no reports of harm during pregnancy or breastfeeding when used in standard cosmetic concentrations. That said, this is not medical advice and anyone who is pregnant or nursing should ask a doctor before introducing new skincare products to be on the safe side.
The molecule does not make skin more sensitive to sunlight, so it will not add to the risk of sunburn or hyperpigmentation. It is also odorless and non-volatile, making it comfortable for everyday use in both rinse-off and leave-on formulas.
Potential Side Effects/Adverse Reactions
Responses to topical C14-15 Alketh-13 differ from person to person. The following points list potential side effects that might occur, though most users will not experience them when the ingredient is properly formulated and used as intended.
- Mild skin irritation or redness
- Allergic contact dermatitis in individuals sensitive to polyethylene glycols
- Eye stinging or watering if the product accidentally gets into the eyes
- Enhanced absorption of other active ingredients, which could intensify their effects in rare cases
If you experience any unwanted reaction stop using the product and seek guidance from a healthcare professional.
Comedogenic Rating
Rating: 1 / 5 (low)
C14-15 Alketh-13 is considered unlikely to clog pores because its polyethylene glycol backbone keeps the molecule water friendly and prevents it from forming heavy, waxy films on skin. It tends to sit on the surface, rinse away easily in cleansers and remain at low percentages in leave-on products, all of which further reduce the chance of pore blockage.
That makes it generally suitable for people prone to acne or breakouts. Only a small fraction of users with very reactive, occlusive-sensitive skin may notice issues.
Keep in mind the rating applies to the ingredient by itself. A formula that also contains rich plant butters or heavy oils could still feel pore clogging even if its emulsifier is non-comedogenic.
Summary
C14-15 Alketh-13 is an emulsifier that keeps oil and water mixed so creams, lotions and makeup stay smooth and stable. It does this by pairing an oil-loving fatty alcohol section with a water-loving polyethylene glycol chain, allowing it to sit at the border of both phases and hold them together.
While not as famous as some classic surfactants, it shows up in a fair share of modern skincare and haircare because it offers reliable performance without a heavy feel. Brands appreciate its versatility across textures, and consumers rarely notice it except for the nice consistency it gives the final product.
Safety reviews place C14-15 Alketh-13 in the low-risk category at typical cosmetic levels. Most people tolerate it well, but as with any new product it is wise to do a quick patch test to rule out personal sensitivities.