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Ingredient on hair labels

Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate

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

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Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate is on 3 of the 177 hair-product labels we compare, from 1 maker, most often in shampoos. The EU ingredient register lists one use for it: antioxidant. 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: “Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate is the organic compound.”

CAS number
6683-19-8
EC number
229-722-6

What the register lists it for

These are the uses the European Commission’s CosIng register lists for Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate 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.

Antioxidant

Slows the oxygen damage that makes oils go rancid in the bottle. Vitamin E (tocopherol) is the common one.

Register definition: “Inhibiting reactions promoted by oxygen, thus avoiding oxidation and rancidity.”

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 Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate Check every name on your own label All ingredients on the labels we compare

Other antioxidant 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.