What it is
In the register’s words: “Alpha-Isomethyl Ionone is the organic compound.”
- EU register name (INCI)
- ALPHA-ISOMETHYL IONONE
- CAS number
- 127-51-5
- EC number
- 204-846-3
- Other names in the register
- Methyl-gamma-ionone; gamma-Methylionone
What the register lists it for
These are the uses the European Commission’s CosIng register lists for Alpha-Isomethyl Ionone 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.
- Perfuming
-
Used as a perfume or scent material. Essential oils and their scent compounds, such as linalool and limonene, carry this role.
Register definition: “Used for perfume and aromatic raw materials.”
- 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.
- Shampoos 1 label First five names: 0 of 1 Shampoos without it
- Deep conditioners 1 label First five names: 0 of 1 Deep conditioners without it
- Leave-in conditioners 1 label First five names: 0 of 1 Leave-in conditioners without it
- Stylers 2 labels First five names: 0 of 2 Stylers without it
- Protein treatments 1 label First five names: 0 of 1 Protein treatments without it
- Hair oils 1 label First five names: 0 of 1 Hair oils without it
Every label, product by product (7)
- Ouidad Curl Quencher Moisturizing Shampoo Shampoo 26th of 37 names
- DevaCurl Melt Into Moisture Deep conditioner 32nd of 41 names
- DevaCurl Leave-In Decadence Leave-in conditioner 30th of 39 names
- Ouidad Curl Quencher Moisturizing Styling Gel Styler 28th of 38 names
- Cécred Moisture Sealing Lotion Styler 48th of 48 names
- ApHogee Two-Step Protein Treatment Protein treatment 15th of 29 names
- Cécred Nourishing Hair Oil Hair oil 31st of 31 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 perfuming ingredients on these labels
- Linalool 63 labels
- Citronellol 24 labels
- Geraniol 24 labels
- Hexyl Cinnamal 21 labels
- Coumarin 15 labels
- Benzyl Salicylate 12 labels
- Linum Usitatissimum (Linseed) Seed Oil 11 labels
- Amyl Cinnamal 9 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.