Isononyl Isononanoate — Allergy Risk & Safety Profile
INCI: ISONONYL ISONONANOATE
Key Facts
- CAS Number
- 59219-71-5
- Category
- emollient
- Risk Level
- low
- Common Allergen
- No
- Found In
- foundation, primer
Is Isononyl Isononanoate safe in cosmetics?
Isononyl Isononanoate is rated low risk in cosmetic products. It is not classified as a common allergen and is generally well-tolerated by most skin types. Commonly found in foundation, primer.
What is Isononyl Isononanoate?
Isononyl Isononanoate is a emollient commonly used in cosmetic and personal care products. It is generally considered safe at recommended concentrations.
Allergy & Safety Information
Isononyl Isononanoate is considered safe for cosmetic use.
This ingredient is considered low risk from an allergenicity perspective. Reactions are uncommon at typical cosmetic use concentrations. However, no ingredient is universally safe — if you notice redness, itching, or irritation after using a product containing this ingredient, discontinue use and monitor whether symptoms resolve.
About Emollient Ingredients
Emollients soften and smooth skin by filling gaps between skin cells and reducing transepidermal water loss. They form the backbone of most moisturisers, creams, and lotions. Most emollients are well-tolerated, but some — particularly plant-derived oils — contain proteins or compounds that can cause reactions in sensitised individuals.
Relevance for Isononyl Isononanoate: Emollients derived from nuts (shea butter, macadamia oil), latex cross-reactive fruits (avocado oil), or highly fragrant plants (rosehip, sea buckthorn) carry higher allergenicity than refined synthetic emollients like squalane or dimethicone.
How to Identify Isononyl Isononanoate in Products
Cosmetic ingredients are listed by their INCI (International Nomenclature of Cosmetic Ingredients) name in descending order of concentration. To check whether a product contains Isononyl Isononanoate, scan the ingredient list for its INCI name exactly as it appears above. Ingredients present at 1% or less may appear in any order after the 1% threshold.
Product types to prioritise checking: Foundation, Primer. These product categories are the most common sources of Isononyl Isononanoate exposure based on formulation data.
Not sure if your products contain Isononyl Isononanoate? Paste the ingredient list into the free ingredient checker to scan for Isononyl Isononanoate and other allergens automatically.
Frequently Asked Questions
Is Isononyl Isononanoate safe?
Yes, well-tolerated by most skin types.
What does Isononyl Isononanoate do?
Functions as a emollient in formulations.
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Is Isononyl Isononanoate causing YOUR skin reactions?
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