What Is C12-14 Sec-Alketh-15?
C12-14 Sec-Alketh-15 is a man made ingredient created by attaching polyethylene glycol (PEG) units to a blend of synthetic secondary fatty alcohols that have 12 to 14 carbon atoms. On average, fifteen PEG units are linked to each alcohol molecule, giving the material its water friendly character. This mix of oil loving alcohols and water loving PEG chains makes the ingredient ideal for combining oil and water in cosmetic formulas.
The technology behind fatty alcohol ethoxylates dates back to the mid 20th century when chemists searched for milder, more versatile alternatives to soap. Over time, advances in control of chain length and ethoxylation levels led to ingredients like C12-14 Sec-Alketh-15 that could meet stricter safety and performance standards now expected in personal care.
Manufacturing starts with petrochemical or plant derived fatty alcohols that are converted into secondary alcohols. These are then reacted with ethylene oxide gas under heat and pressure in the presence of a catalyst. By stopping the reaction after roughly fifteen repeating units are added, makers obtain a liquid or soft solid that dissolves readily in water yet still carries enough oil loving character to interact with lipids.
Thanks to this balanced profile, C12-14 Sec-Alketh-15 shows up in many rinse off and leave on products. You might find it in facial cleansers, body washes, moisturizers, sunscreens, hair masks, styling creams and even makeup. Formulators rely on it whenever they need to keep oily ingredients evenly dispersed, improve product texture and maintain stability over a wide temperature range.
C12-14 Sec-Alketh-15’s Cosmetic Benefits/Uses
C12-14 Sec-Alketh-15 plays more than one helpful role in cosmetics
- Emulsion stabilising – once oil and water are blended, this ingredient positions itself at the interface to prevent the two phases from separating. The result is a smoother, longer lasting cream or lotion that looks the same from the first use to the last
- Emulsifying – during manufacturing it helps bring oil and water together in the first place, cutting down mixing time and energy. This function lets brands create lightweight, pleasant textures that spread easily on skin or hair without a greasy feel
Who Can Use C12-14 Sec-Alketh-15
C12-14 Sec-Alketh-15 is generally considered suitable for all skin types, including oily, combination, normal and dry skin, because it is non occlusive and rinses clean without leaving a heavy residue. People with very sensitive or compromised skin should still pay attention to overall formula strength, as high levels of any surfactant type ingredient can occasionally feel drying or cause mild stinging.
The ingredient is synthetic and does not rely on animal derived raw materials, so it is typically appropriate for vegans and vegetarians. Manufacturers often confirm this status on the product label or website.
No data suggest that topical exposure poses a particular risk to pregnant or breastfeeding women. That said, this is not medical advice and anyone who is pregnant or nursing should review all personal care products with a healthcare professional to be extra cautious.
C12-14 Sec-Alketh-15 does not increase photosensitivity, so it will not make skin more prone to sunburn. Normal daily sun protection practices are still recommended whenever you are outdoors.
Potential Side Effects/Adverse Reactions
Side effects from topical use of C12-14 Sec-Alketh-15 can differ from one person to another. The points below list potential reactions but most users will not encounter them when the ingredient is used at typical cosmetic levels.
- Mild skin irritation – a temporary feeling of tightness or slight redness, more likely in people with very sensitive skin or when used in high concentration
- Allergic contact dermatitis – rare cases of itching, rash or swelling due to an individual allergy to the PEG portion of the molecule
- Eye irritation – stinging or watering can occur if a product containing this ingredient accidentally enters the eyes
- Excessive dryness – possible if the surrounding formula lacks enough moisturising agents to counterbalance cleansing action
If you notice persistent irritation, redness or any other adverse reaction while using a product that contains C12-14 Sec-Alketh-15 stop using it and consult a healthcare professional
Comedogenic Rating
Rating: 1 (very low)
C12-14 Sec-Alketh-15 is highly water soluble and does not leave a greasy film that could block pores. Its primary job is to keep oil and water mixed rather than coat skin with a heavy layer of lipids. Because it rinses away easily and is usually present at modest levels the risk of clogging pores is minimal.
Suitable for acne-prone or breakout-prone skin.
Keep in mind that overall product formulation matters; rich oils or waxes paired with this ingredient could still cause congestion even though C12-14 Sec-Alketh-15 itself is low risk.
Summary
C12-14 Sec-Alketh-15 is an emulsifier and emulsion stabiliser that bridges the gap between oil and water. Its PEG side helps it dissolve in water while its fatty alcohol backbone anchors into oils, giving creams and lotions a uniform, smooth texture that stays mixed over time.
It is a behind-the-scenes workhorse found in a fair number of cleansers, lotions, sunscreens and hair treatments, yet it rarely makes the marketing headlines. Formulators appreciate its reliability and ease of use even if most shoppers have never heard of it.
Safety studies and long-standing industry use show it to be low risk for irritation or sensitisation in the vast majority of people. As with any new cosmetic ingredient it is wise to patch test a product before regular use to be sure it agrees with your unique skin.