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Ingredient on hair labels

Silk Amino Acids

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

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Silk Amino Acids is on 3 of the 177 hair-product labels we compare, from 2 makers, most often in stylers. Its uses in the EU ingredient register are hair conditioning, humectant and skin conditioning. 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: “Protein hydrolyzates, silk.”

EU register name (INCI)
SILK AMINO ACIDS
CAS number
96690-41-4
EC number
306-235-8

What the register lists it for

These are the uses the European Commission’s CosIng register lists for Silk Amino Acids 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.

Hair conditioning

The register’s hair role for ingredients that make hair feel softer, smoother or easier to comb. Most conditioners, masks and leave-ins list several.

Register definition: “Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.”

Humectant

Holds water in the product and on the surface it touches. Glycerin, honey and aloe are common humectants on curly-hair labels.

Register definition: “Retaining and/or preserving the moisture in a product during use.”

Skin conditioning

The register’s broad role for ingredients that keep skin in good condition. On a hair label it often sits beside a hair role, or marks a plant oil or extract.

Register definition: “Maintaining the skin in good condition.”

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 (3)

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 Silk Amino Acids Check every name on your own label All ingredients on the labels we compare

Other hair conditioning 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.