Is Alpha-Isomethyl Ionone fungal acne safe?
Alpha-Isomethyl Ionone is generally considered safe for fungal-acne-prone skin. EU-26 fragrance allergen (sensitizer); not a Malassezia substrate; safe for FA but may irritate sensitive skin.
Also known as Isomethyl ionone
Why this verdict
EU-26 fragrance allergen (sensitizer); not a Malassezia substrate; safe for FA but may irritate sensitive skin.
Fungal acne, properly called malassezia folliculitis, is driven by a yeast that feeds on fatty acids in roughly the C11 to C24 range. An ingredient is a concern when it can supply usable fatty acids in that window, and it is generally fine when it cannot. Chain length and ethoxylation can both change the verdict, which is why the chemical family alone does not decide it. See the full trigger list and how we assess ingredients for the reasoning and sources.
Frequently asked questions
Is Alpha-Isomethyl Ionone safe for fungal acne?
Alpha-Isomethyl Ionone is generally considered safe for fungal-acne-prone skin. EU-26 fragrance allergen (sensitizer); not a Malassezia substrate; safe for FA but may irritate sensitive skin. This is informational only and not a diagnosis; suitability varies by person and formulation.
Why is Alpha-Isomethyl Ionone considered fungal-acne safe?
EU-26 fragrance allergen (sensitizer); not a Malassezia substrate; safe for FA but may irritate sensitive skin. Fungal acne (malassezia folliculitis) is driven by ingredients that supply fatty acids in roughly the C11 to C24 range that the yeast can metabolize; Alpha-Isomethyl Ionone is assessed against that mechanism.
Assessed using: Folliculitis Scout, EU Cosmetics Reg. Annex III.
This page is informational only and is not medical advice or a diagnosis. Fungal acne can resemble other skin conditions, and ingredient suitability varies by person and by formulation. Verdicts reflect community-reported data and malassezia lipid research, not a guarantee for your skin. Always patch test and consult a qualified clinician.