What Is C11-15 Pareth-7 Carboxylic Acid?
C11-15 Pareth-7 Carboxylic Acid is a synthetic ingredient made from mid-length fatty alcohols that usually come from coconut, palm kernel or petroleum sources. These fatty alcohols are first reacted with about six units of ethylene oxide, a process called ethoxylation, which gives the molecule water-loving sections. A final step adds a carboxylic acid group so the ingredient can work in a wider pH range. Chemists began using this class of surfactants in the late 1970s when brands needed gentler but still effective cleaners for skin and hair. Today you will spot it in facial cleansers, micellar waters, shampoos, body washes, makeup removers, exfoliating masks and light lotions where it helps keep oil and water mixed.
C11-15 Pareth-7 Carboxylic Acid’s Cosmetic Benefits/Uses
This multitasker supports both formula stability and the washing step in daily care products
- Cleansing: Lifts away excess oil, dirt and makeup then rinses off easily so skin and hair feel fresh without a tight after-feel
- Emulsifying: Keeps oil and water evenly blended which stops the product from separating and delivers a smooth, uniform texture every time you use it
Who Can Use C11-15 Pareth-7 Carboxylic Acid
Because it is a mild non ionic surfactant, C11-15 Pareth-7 Carboxylic Acid generally suits normal, combination and oily skin as well as most sensitive complexions. People with very dry or compromised skin barriers may find frequent use slightly drying so pairing the product with a rich moisturizer is advised.
The ingredient is synthesised from plant or petroleum feedstocks with no animal derived components, making it suitable for vegans and vegetarians provided the finished product also follows cruelty free standards.
No data indicates any special risk for pregnant or breastfeeding women when the ingredient is applied topically in wash off or leave on products. This is not medical advice and anyone who is expecting or nursing should discuss new skincare items with their physician to be extra safe.
C11-15 Pareth-7 Carboxylic Acid does not increase photosensitivity so it will not make skin more prone to sunburn. It can also be used on color treated hair without stripping dye.
Potential Side Effects/Adverse Reactions
Individual responses to skincare ingredients vary and the following lists potential rather than guaranteed reactions. When formulated at the standard levels used in cosmetics most people experience no problems.
- Mild transient dryness or tightness, especially on very dry or eczema prone skin
- Light stinging or redness if applied to broken or freshly exfoliated skin
- Rare allergic contact dermatitis presenting as itching rash or swelling
- Eye irritation if the cleanser accidentally enters the eyes
If any of these effects occur discontinue use and seek advice from a healthcare professional or dermatologist.
Comedogenic Rating
Rating: 1 / 5
C11-15 Pareth-7 Carboxylic Acid is a small-amount surfactant that rinses clean and does not linger in pores. While it comes from fatty alcohols, the added ethylene oxide chains and carboxylic acid group make it highly water soluble which reduces any film-forming tendency. For that reason it earns a very low comedogenic score of 1.
Most people who are prone to acne or breakouts can use products containing this ingredient without seeing extra clogging.
As with any cleansing agent, residue left on skin could mix with other richer ingredients and raise the clogging risk so thorough rinsing is best practice.
Summary
C11-15 Pareth-7 Carboxylic Acid works as a gentle cleanser and reliable emulsifier. Its fatty alcohol tail grabs onto oil while its ethoxylated and acidic head loves water, allowing it to lift grime then keep formulas smooth and uniform. You will find it in everyday face washes, micellar waters and lightweight lotions, though it is more of a behind-the-scenes helper than a headline star.
Overall safety data show a low irritation profile at the levels used in cosmetics so most users tolerate it well. As with any new product it is wise to run a quick patch test to rule out personal sensitivities.