What Is C12-14 Sec-Pareth-5?
C12-14 Sec-Pareth-5 is a synthetic ingredient created by reacting a blend of mid-length fatty alcohols (those with 12 to 14 carbon atoms) with roughly five units of ethylene oxide. The fatty alcohols are “secondary,” meaning the hydroxyl group sits on the second carbon in the chain rather than the first. This subtle shift gives the molecule different surface-active properties compared with primary alcohol ethoxylates. Manufacturers first developed these secondary ethoxylates in the late 1970s as an alternative to traditional surfactants that could offer reliable foam control and improved skin feel. Today the process is highly standardized: plant-derived or petroleum-based fatty alcohols are purified, then put through controlled ethoxylation under heat and pressure until the desired five-unit average is reached. The resulting clear liquid or paste is filtered, quality-checked and blended into cosmetic bases.
You will most often see C12-14 Sec-Pareth-5 in rinse-off formulas where quick cleaning and easy rinsing are priorities, such as facial cleansers, body washes and shampoos. It also shows up in lightweight lotions, serums, sheet masks and sun care products where formulators want to keep emulsions stable without adding a heavy feel.
C12-14 Sec-Pareth-5’s Cosmetic Benefits/Uses
Formulators choose this multifunctional ingredient for several practical reasons:
- Antifoaming: Helps knock down excessive foam, letting products rinse faster and feel less slimy during use
- Emulsion stabilising: Keeps oil and water phases mixed so the product looks uniform from first pump to last squeeze
- Cleansing: Lifts away dirt, oil and makeup without the squeaky dryness some harsher surfactants cause
- Emulsifying: Allows oils, butters and active ingredients to disperse evenly giving a smooth texture and consistent delivery on the skin
Who Can Use C12-14 Sec-Pareth-5
C12-14 Sec-Pareth-5 is generally well tolerated by normal, oily and combination skin thanks to its balanced cleansing power and low residue. Dry or sensitized skin can also use it in rinse-off products, though very dry or eczema-prone skin may prefer formulas paired with extra moisturizers to counter any lipid removal.
The ingredient is produced from plant-derived or petroleum-based fatty alcohols and ethylene oxide without animal derivatives so it is suitable for vegetarians and vegans.
No data link C12-14 Sec-Pareth-5 to hormonal activity or developmental toxicity, so products containing it are considered safe for use during pregnancy and breastfeeding. This is not medical advice; expectant or nursing individuals should check any skincare routine with a qualified health professional.
C12-14 Sec-Pareth-5 is not known to make skin more sensitive to sunlight, so there is no special photoprotection concern beyond normal daily SPF use.
Potential Side Effects/Adverse Reactions
Side effects from topical use of C12-14 Sec-Pareth-5 vary from person to person. The points below list potential reactions that are possible but unlikely when the ingredient is used correctly in a finished cosmetic product.
- Transient stinging or burning
- Mild redness or irritation, especially on compromised skin
- Dryness or tightness after frequent or prolonged exposure in high-foaming cleansers
- Eye irritation if the product accidentally enters the eyes
If any irritation or discomfort occurs discontinue use and consult a healthcare professional if symptoms persist.
Comedogenic Rating
Rating: 1 / 5. C12-14 Sec-Pareth-5 is a water-soluble surfactant that rinses off almost completely, leaving little to sit inside pores and mix with skin oil. It is made from lightweight fatty alcohols that have been modified to boost cleansing power rather than leave a greasy film, which is why the risk of clogged pores is very low. People who break out easily can normally use products containing this ingredient without seeing more blackheads or pimples. The tiny chance of issues usually comes from the rest of the formula, not the surfactant itself.
Summary
C12-14 Sec-Pareth-5 acts as a cleanser, emulsifier, emulsion stabiliser and antifoaming agent. Its structure lets one end grab oil and the other mix with water, so it lifts away dirt and makeup while keeping lotions and washes looking smooth and even. The ingredient is useful in face washes, body washes, shampoos and even light creams, yet it is not as famous as classic surfactants like sodium laureth sulfate. Formulators who know it value its mild feel and tidy rinse.
Safety reviews and product testing show it is low risk for most skin types. Still, everyone’s skin is different so it is smart to patch test any new product that lists C12-14 Sec-Pareth-5 on the label, just to be sure it suits you.