What Is C12-15 Pareth-10 Phosphate?
C12-15 Pareth-10 Phosphate is a liquid or paste-like ingredient made by combining medium-chain fatty alcohols derived from coconut or palm oil with about ten units of ethylene oxide, then attaching a phosphate group. The result is a mild, water-soluble surfactant that carries both oil-loving and water-loving parts. First explored in the late 1980s as formulators searched for gentler alternatives to traditional sulfates, it earned a place in modern skincare thanks to its balanced cleansing power and ability to work across a broad pH range.
Manufacturing starts with C12-C15 fatty alcohols that undergo ethoxylation, a reaction that adds short chains of ethylene oxide. This step boosts water affinity. The ethoxylated alcohol is then reacted with phosphoric acid to create a phosphate ester, giving the ingredient a negative charge that helps it lift away dirt and oil.
Because of its versatile nature, C12-15 Pareth-10 Phosphate shows up in facial cleansers, micellar waters, body washes, shampoos, makeup removers, scrubs, lightweight lotions and even some wipe solutions where a gentle but effective surfactant is needed.
C12-15 Pareth-10 Phosphate’s Cosmetic Benefits/Uses
This multitasking ingredient supports formula performance in several ways
- Cleansing: Its surfactant structure loosens oil, sweat and makeup so they rinse away easily, giving products a fresh clean feel without stripping skin or hair
- Emulsifying: Helps blend oil and water phases, allowing creams, lotions and cleansing milks to stay smooth and stable while delivering an even layer on skin
Who Can Use C12-15 Pareth-10 Phosphate
This gentle surfactant is suitable for most skin types including oily, combination, normal and dry skin. Sensitive skin generally tolerates it well because it cleanses without the harshness linked to sulfates, though very reactive skin should still monitor for any discomfort. It is not known to worsen common skin concerns such as acne or rosacea.
C12-15 Pareth-10 Phosphate is made from plant-derived fatty alcohols and synthetic processing agents rather than animal sources, so products using it are usually vegan and vegetarian friendly. Always check the full ingredient list to confirm no other animal-based additives are present.
Current safety data do not flag special risks for women who are pregnant or breastfeeding when this ingredient is applied topically in rinse-off or leave-on products. This is not medical advice and anyone who is pregnant or nursing should review any skincare routine with a healthcare professional just to be safe.
The ingredient does not make skin more prone to sunburn and has no known effect on photosensitivity.
Potential Side Effects/Adverse Reactions
Reactions to topical C12-15 Pareth-10 Phosphate differ from person to person. The points below list possible but uncommon side effects. When used at typical cosmetic levels most people will not notice any problems
- Mild skin irritation such as transient redness or stinging, usually linked to very sensitive skin or high use concentrations
- Eye irritation if a cleanser or shampoo accidentally gets into the eyes
- Contact dermatitis in rare cases for individuals with an allergy to ethoxylated surfactants
If irritation or any other adverse reaction occurs stop use and consult a healthcare provider or dermatologist
Comedogenic Rating
Rating: 1 out of 5
C12-15 Pareth-10 Phosphate is highly water soluble and rinses off easily so it does not linger on skin to block pores. It also lacks heavy oils or waxes that would normally raise a clogging risk. Because it is usually included at low levels and often in rinse-off formulas, its tendency to trigger blackheads or whiteheads is very low.
Suitable for acne-prone and breakout-prone skin in most cases.
Formulas that pair this surfactant with rich plant butters or occlusive silicones could be more pore-clogging overall, but the ingredient itself remains low risk.
Summary
C12-15 Pareth-10 Phosphate cleanses by surrounding oil and debris so they can be washed away, emulsifies by helping water and oil mix evenly and stabilizes formulas so textures stay smooth. Its balanced structure gives enough oil affinity to grab grime yet enough water affinity to rinse clean, delivering gentle effectiveness across many product types.
The ingredient sits in the modestly popular middle ground of surfactants, appreciated by formulators seeking sulfate-free options that still foam and feel light. It is not as famous as classic sulfates or the newer amino acid cleansers yet it shows up in a steady stream of face washes, micellar waters and shampoos.
Overall safety data show a low irritation profile for most users and no major toxicity flags. As with any cosmetic ingredient it is smart to patch test a new product first, especially if your skin tends to be sensitive.