Alpha-Isomethyl Ionone is a terpenoid ketone found in Brewer's yeast and Mokryeon. It is used as a flavoring agent in the food industry, a fragrance ingredient in perfumery, and a fragrance ingredient in personal care products. It has a low skin sensitization profile, but it is recommended to avoid it if you have known allergic reactions.
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Not suitable for sensitive skin
Alpha-Isomethyl Ionone has been associated with potential concerns such as allergies, immunotoxicity, and use restrictions. It is recommended to be used within safe limits and concentrations as specified by regulatory bodies.
Alpha-Isomethyl Ionone should be used in accordance with the recommended guidelines and restrictions set by regulatory authorities. It is important to follow the usage instructions and avoid excessive exposure to the ingredient.
Found in Brewer's yeast (Saccharomyces cerevisiae) and Mokryeon (Magnolia Kobus)
Defers review to IFRA program
Worst
Alpha-Isomethyl Ionone is a colorless to pale oily liquid, an isomer of Methyl Ionone, but its sweet orris-like scent is felt more attractive. It is a potential skin sensitiser and allergen in its own right, and is one of the 26 fragrance allergens which EU cosmetics law has specified should be declared on lists of ingredients. It is possible to be allergic to both it and to MI. Alpha-Isomethyl Ionone is a norsesquiterpenoid, having 14 carbon atoms. It is an extremely weak base, with a calculated pKa value of 19.7 (strongest acidic) and -4.8 (strongest basic). The percentage of Alpha-Isomethyl Ionone used in perfumes ranges from 0.1% to 11.9%, with an average of 1.1%. It is usually used in conjunction with hydroxycitronellal, woody notes, copaiba, N-methyl ionone, ionone, or Vetiver. The odor of Alpha-Isomethyl Ionone has been described as woody, violet or floral. Alpha-Isomethyl Ionone is a common fragrance ingredient that is one of the “EU 26 fragrances” that has to be labeled separately (and cannot be simply included in the term “fragrance/perfume” on the label) because of allergen potential. It is best to avoid if your skin is sensitive. Alpha-Isomethyl Ionone is a ketone, a type of organic compound characterized by the presence of a carbonyl group in which the carbon atom is covalently bonded to an oxygen atom. Alpha-isomethyl ionone is a substance that is “banned or restricted”, an “irritant and allergen”, and an “environmental hazard”. It is toxic to aquatic life with long lasting effects. It is restricted for use in cosmetic products in the EU by CosIng, the European Commission database for information on cosmetic substances and ingredients.
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