What Is C12-14 Sec-Alketh-9?
C12-14 Sec-Alketh-9 is a lab made ingredient created by attaching chains of ethylene oxide to a blend of synthetic secondary alcohols that have 12 to 14 carbon atoms. The “9” in its name signals that about nine units of ethylene oxide are linked to each alcohol molecule. This step, called ethoxylation, turns the original oily alcohols into a water friendly substance that can mix oil and water.
The idea of using ethoxylated alcohols in cosmetics dates back to the mid 20th century when formulators looked for gentler substitutes for traditional soaps. Over time C12-14 Sec-Alketh-9 earned a place in personal care because it delivers dependable performance at a reasonable cost. It used to be listed as C12-14 Sec-Pareth-9 but the naming rules changed and “Alketh” replaced “Pareth” for secondary alcohol ethoxylates.
Production starts with petroleum or plant based feedstocks that are turned into secondary alcohols. These alcohols react with ethylene oxide under heat and pressure in the presence of a catalyst. The finished liquid is then purified and quality checked before it heads to cosmetic labs.
You will mostly spot C12-14 Sec-Alketh-9 in rinse off goods such as facial cleansers, body washes, shampoos and scrubs but it can also appear in leave on products like lotions, primers, sunscreens and lightweight creams where a smooth feel and stable texture are needed.
C12-14 Sec-Alketh-9’s Cosmetic Benefits/Uses
This ingredient supports a formula by keeping mixed parts from separating and by helping water spread across oily surfaces.
- Emulsion stabilising – Once an emulsion is formed the ingredient positions itself at the boundary between oil and water to stop the two phases from drifting apart. This extends shelf life and keeps the product looking and feeling the same each time it is used.
- Emulsifying – During manufacturing it helps water blend with oils, fragrances and active ingredients. This lets formulators create creams and lotions that feel light absorb well and rinse off cleanly.
Who Can Use C12-14 Sec-Alketh-9
C12-14 Sec-Alketh-9 is generally fine for all skin types including oily, combination, normal and dry skin because it does not leave a heavy residue or clog pores. Sensitive skin can usually tolerate it as well since the molecule has a low irritation profile, though people with a known sensitivity to ethoxylated ingredients may prefer to steer clear.
The compound is synthetic and does not rely on animal-derived raw materials, so it is suitable for vegans and vegetarians. Brands that follow cruelty-free standards also tend to approve its use because it does not require animal testing for basic safety data in most regions.
No specific warnings exist for pregnant or breastfeeding women when it comes to topical use of C12-14 Sec-Alketh-9. Still, this is not medical advice and anyone who is expecting or nursing should show the full ingredient list of any product to their healthcare provider just to be safe.
The ingredient does not make skin more sensitive to sunlight. It can be worn during the day without increasing the risk of sunburn or pigmentation. It is also odorless and colorless so it will not interfere with fragrance or tint in a finished formula.
Potential Side Effects/Adverse Reactions
Reactions to C12-14 Sec-Alketh-9 can differ from person to person. The points below outline potential issues yet they are uncommon when the ingredient is used at typical cosmetic levels.
- Mild skin irritation in people who already have very reactive or compromised skin barriers
- Eye stinging if a cleanser or shampoo containing the ingredient is not rinsed out fully
- Contact dermatitis in rare cases for individuals allergic to ethoxylated alcohols
If you notice redness itching or any other unusual reaction stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 1/5. C12-14 Sec-Alketh-9 is a water-soluble surfactant that does not linger on the skin or leave an oily film, so it has a very low tendency to block pores. Most formulas use it in rinse-off products or at low levels in leave-ons, further reducing any pore-clogging risk.
Suitable for acne-prone or breakout-prone skin.
One point to note is that overall comedogenicity can change based on the full formula. Even a low-risk ingredient like this can feel heavier if paired with rich oils or waxes, so always judge the finished product rather than the single component.
Summary
C12-14 Sec-Alketh-9 acts as an emulsifier and emulsion stabiliser. Its ethoxylated structure has a water-loving end and an oil-loving end, letting it pull oil and water together during manufacturing and then hold that mix in place on the shelf and on the skin.
The ingredient is popular in everyday cleansers shampoos and light lotions because it performs reliably at a modest cost. It is not a market superstar like hyaluronic acid or glycerin yet formulators turn to it when they need fuss-free stability.
Safety data show a low irritation profile and virtually no long-term concerns at cosmetic use levels. Still everyone’s skin is unique so do a quick patch test when trying any new product that lists C12-14 Sec-Alketh-9 to make sure it agrees with you.