Alpha-Isomethyl Ionone
(E)-3-methyl-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one
EU Annex III fragrance allergen; synthetic violet/iris aroma chemical; commonly used in personal care products for violet-like floral notes; moderate sensitization potential; IFRA restricts in leave-on skin care applications
Function & Common Use
Fragrance / Perfuming / Aroma Chemical
Fragrance Materials
Violet and iris-type perfumes, floral fragrances, fine fragrance, body care, personal care
Synthetic
Concentration Limits
Declaration required above 0.001% leave-on / 0.01% rinse-off
Declaration threshold: 0.001% leave-on / 0.01% rinse-off (EU Reg 2023/1545)
None (FEMA GRAS); IFRA-guided
None specific
Format restriction: EU mandatory declaration when above threshold; IFRA 49th Amendment limits by category
Baby restriction: No
Pregnancy: No
IFRA: Yes - IFRA 49th Amendment; Category 4 (body leave-on): 0.3%; Category 5A (face leave-on): 0.2%; Category 1 (fine fragrance): 5.0%; rinse-off: higher limits
Frequently Asked Questions
Is Alpha-Isomethyl Ionone safe to use in skincare?
Alpha-Isomethyl Ionone has a Medium concern rating. EU Annex III fragrance allergen; synthetic violet/iris aroma chemical; commonly used in personal care products for violet-like floral notes; moderate sensitization potential; IFRA restricts in leave-on skin care applications
Is Alpha-Isomethyl Ionone allowed in India?
Alpha-Isomethyl Ionone is currently classified as "Permitted" under Indian cosmetics regulations. The maximum permitted concentration is Declaration required above 0.001% leave-on / 0.01% rinse-off.
What is Alpha-Isomethyl Ionone used for in cosmetics?
Alpha-Isomethyl Ionone functions as: Fragrance / Perfuming / Aroma Chemical. It is commonly found in: Violet and iris-type perfumes, floral fragrances, fine fragrance, body care, personal care.
Can Alpha-Isomethyl Ionone cause an allergic reaction?
Yes. Alpha-Isomethyl Ionone has an allergen flag (Yes - EU Annex III fragrance allergen). If you have sensitive skin or known fragrance/contact allergies, patch-test products containing this ingredient before full use.
Is Alpha-Isomethyl Ionone safe for babies?
Alpha-Isomethyl Ionone has baby/child restrictions: No. Avoid using products containing this ingredient on infants unless specifically formulated and labelled for baby use.
Regulatory Status
EU Annex: Annex III (fragrance allergen - declaration required)
Identifiers
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