What it is
In the register’s words: “Hydroxyacetophenone is the organic compound.”
- EU register name (INCI)
- HYDROXYACETOPHENONE
- CAS number
- 99-93-4
- EC number
- 202-802-8
What the register lists it for
These are the uses the European Commission’s CosIng register lists for Hydroxyacetophenone 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.
- Shampoos 2 labels First five names: 0 of 2 Shampoos without it
- Clarifying shampoos 1 label First five names: 0 of 1 Clarifying shampoos without it
- Deep conditioners 1 label First five names: 0 of 1 Deep conditioners without it
- Stylers 1 label First five names: 0 of 1 Stylers without it
- Heat protectants 1 label First five names: 0 of 1 Heat protectants without it
Every label, product by product (6)
- Kristin Ess Moisture Rich Curl Shampoo Shampoo 26th of 41 names
- PATTERN Hydration Shampoo Shampoo 27th of 42 names
- Cécred Clarifying Shampoo & Scalp Scrub Clarifying shampoo 22nd of 31 names
- Bouclème Intensive Moisture Treatment Deep conditioner 40th of 50 names
- Bouclème Super Volumising Foam Styler 32nd of 36 names
- Bouclème Curl Defence Spray Heat protectant 6th of 35 names
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
Other antioxidant ingredients on these labels
- Tocopherol 45 labels
- Tocopheryl Acetate 30 labels
- Melaleuca Alternifolia (Tea Tree) Leaf Oil 7 labels
- Ascorbic Acid 4 labels
- Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate 3 labels
- Punica Granatum (Pomegranate) Extract 3 labels
- Sodium Metabisulfite 3 labels
- Apium Graveolens (Celery) Seed Extract 2 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.