What Is Sodium C9-15 Pareth-3 Sulfate?
Sodium C9-15 Pareth-3 Sulfate is a surfactant that starts life as a blend of fatty alcohols containing nine to fifteen carbon atoms. These alcohols can be sourced from either petrochemicals or plant oils such as coconut or palm. During manufacturing the alcohol mix is first reacted with a small amount of ethylene oxide, on average three units per alcohol molecule, which adds water-loving “ethoxy” groups. The resulting ethoxylated alcohol is then treated with sulfuric acid to create a sulfate ester, and finally neutralized with sodium hydroxide to yield the sodium salt we see on ingredient lists.
Sulfated surfactants like this one entered the personal care world in the mid-20th century when formulators looked for efficient, cost-effective cleansers that lather well in hard or soft water. Since then Sodium C9-15 Pareth-3 Sulfate has gained popularity for delivering a rich foam while being milder than some older sulfates.
You will most often find it in rinse-off products where a strong yet balanced cleansing action is needed. Common examples include shampoos, facial cleansers, body washes, bubble baths, liquid hand soaps, exfoliating scrubs and makeup-removing wipes. It may also appear in micellar waters or pre-shave washes that rely on gentle surfactant systems.
Sodium C9-15 Pareth-3 Sulfate’s Cosmetic Benefits/Uses
This ingredient serves a single but essential purpose in cosmetics
As a cleansing agent Sodium C9-15 Pareth-3 Sulfate lowers the surface tension of water so oils, dirt and product buildup can be lifted away and rinsed off. It contributes creamy foam and a fresh skin feel, helping formulas spread easily and rinse clean without heavy residue.
Who Can Use Sodium C9-15 Pareth-3 Sulfate
Most skin types tolerate this surfactant well, especially normal, oily and combination skin that appreciate a deep cleanse. Those with very dry or already irritated skin might find frequent use a bit stripping because sulfates can remove some of the natural oils that keep the skin barrier comfortable. If your complexion is highly sensitive it is worth choosing formulas where this ingredient is paired with soothing additives like glycerin or panthenol.
Sodium C9-15 Pareth-3 Sulfate is typically sourced from plant oils or petrochemicals, not animals, so it is usually suitable for vegans and vegetarians. Check with the brand if you need confirmation about the entire supply chain.
There are no known issues that prevent pregnant or breastfeeding women from using products containing this cleanser, but this is not medical advice and anyone who is expecting or nursing should run their skincare routine past a doctor just to be safe.
The ingredient does not make skin more sensitive to sunlight and it has no documented effect on photosensitivity. It is also considered safe for most hair types, though people with freshly dyed or chemically treated hair may prefer gentler sulfate-free options to prolong color vibrancy.
Potential Side Effects/Adverse Reactions
Reactions to topical Sodium C9-15 Pareth-3 Sulfate vary from person to person. The following is a list of potential side effects that could occur, but they are uncommon when the ingredient is used correctly in a finished cosmetic formula.
- Skin dryness – over cleansing can strip natural oils leaving the skin tight or flaky
- Temporary irritation or redness – more likely on sensitive or compromised skin barriers
- Eye stinging – if the product gets into the eyes during rinsing
- Contact dermatitis – rare allergic response resulting in itching or rash
- Color fading in dyed hair – strong cleansers can accelerate washout of artificial pigments
If you notice any of these issues discontinue use and consult a healthcare professional or dermatologist for guidance.
Comedogenic Rating
Rating: 0/5
Sodium C9-15 Pareth-3 Sulfate is a water-soluble cleansing agent that rinses away completely and does not leave an oily film that could block pores. It is used in very small amounts and typically in rinse-off products, further reducing any chance of buildup. Because it lacks heavy or occlusive properties, the likelihood of it triggering comedones is virtually zero.
Suitable for acne-prone or breakout-prone skin.
As with any surfactant, over-cleansing can disrupt the skin barrier which may indirectly aggravate acne, so moderation matters.
Summary
Sodium C9-15 Pareth-3 Sulfate acts mainly as a cleanser. By lowering water’s surface tension it allows oils, dirt and styling residues to mix with water and wash down the drain, giving formulas a rich foam and a fresh afterfeel.
It is popular in shampoos, body washes and facial cleansers because it balances strong cleansing with a milder profile than classic sulfates. Still, it is not as trendy as sulfate-free alternatives that have surged in recent years.
Regulatory panels consider the ingredient safe at the concentrations used in cosmetics, and adverse reactions are rare. Even so, skin is personal so patch testing a new product is always a smart idea before fully committing.