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Ingredient on hair labels

C11-15 Pareth-7

TheWashDay editorial · Updated · From the EU ingredient register and the makers’ own labels · How we match names

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C11-15 Pareth-7 is on 4 of the 177 hair-product labels we compare, from 2 makers, most often in protein treatments. Its uses in the EU ingredient register are emulsifying surfactant and cleansing surfactant. None of these labels names it among its first five ingredients.

See it on each label Products without it

What it is

In the register’s words: “Alcohols, C11-15, ethoxylated (7 mol EO average molar ratio).”

EU register name (INCI)
C11-15 PARETH-7
CAS number
173244-48-9
Written on these labels as
C11-15 Pareth-7; C11-15 Pareth-7 (C11-15 Alketh-7)

What the register lists it for

These are the uses the European Commission’s CosIng register lists for C11-15 Pareth-7 in any cosmetic, hair roles first. They say why a maker might add it, not what it does in one formula, and they aren’t a safety rating.

Emulsifying surfactant

Lets oil and water mix into one cream or lotion and stay mixed. Conditioners and creams rely on them.

Register definition: “Helping suspensions or dispersions of liquids in a second liquid by reducing the surface tension of the substances to be emulsified.”

Cleansing surfactant

The washing ingredients: they let water lift oil, product and dirt off hair and scalp. Shampoos list them near the top; some conditioners hold a little.

Register definition: “Wetting body surfaces, emulsifying or solubilizing oils, and suspending soil (generally, such ingredients contribute to the foaming and lathering properties of cleansing products).”

Where it sits on each label

US labels list ingredients from most to least, except that those at 1% or less may follow in any order. A name near the top is a large part of the formula. A label doesn’t mark where the 1% point falls, so further down, the order says little about how much is in it.

Every label, product by product (4)

Each line runs from the first name on a label to the last; a dot is where this ingredient sits. Makers change formulas now and then; if the list on your bottle differs, go by your bottle.

Your next step

Find products without C11-15 Pareth-7 Check every name on your own label All ingredients on the labels we compare

Other emulsifying surfactant ingredients on these labels

Updated · The name, numbers and uses come from the European Commission’s CosIng entry (CC BY 4.0); we write the uses in US spelling and put the hair ones first. The labels are each maker’s own. The order rule is the FDA’s Cosmetics Labeling Guide. All our sources are on the Sources page.