Limonene — Allergy Risk & Safety Profile
INCI: LIMONENE
Also known as: D-Limonene, Citrus Terpene
Key Facts
- CAS Number
- 5989-27-5
- Category
- fragrance
- Risk Level
- medium
- Common Allergen
- Yes
- Found In
- all fragranced products, cleaning products
Is Limonene safe in cosmetics?
Limonene is rated medium risk in cosmetic products. It is a known allergen that can cause contact dermatitis in sensitized individuals. Common fragrance allergen. Fresh limonene is not allergenic — it becomes allergenic after oxidation. Safer alternatives include Fragrance-free products, Essential oil-free formulations. Commonly found in all fragranced products, cleaning products.
What is Limonene?
Citrus-scented fragrance component. Oxidizes on air exposure to form allergenic compounds.
Allergy & Safety Information
Limonene is generally safe for most people but may cause irritation or allergic reactions in sensitive individuals. If you experience redness, itching, or swelling after using a product with this ingredient, discontinue use and consult a dermatologist.
This ingredient carries moderate allergenicity risk. It can cause reactions in sensitised individuals but has a lower sensitisation rate than high-risk ingredients. Patch testing before full use is advisable for anyone with a history of cosmetic reactions.
About Fragrance Component Ingredients
Fragrance ingredients are added to cosmetics for scent or to mask the odour of raw materials. The EU requires 26 specific fragrance allergens to be listed individually on labels when present above threshold concentrations. Fragrance (listed as "parfum") is the single most common cause of cosmetic contact dermatitis worldwide.
Relevance for Limonene: Even products labelled "unscented" may contain masking fragrances. True fragrance-free products list no perfuming ingredients at all. If you are fragrance-sensitive, check for "parfum," "fragrance," and all 26 EU-listed fragrance allergens on any product label.
How to Identify Limonene 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 Limonene, 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: All fragranced products, Cleaning products. These product categories are the most common sources of Limonene exposure based on formulation data.
Not sure if your products contain Limonene? Paste the ingredient list into the free ingredient checker to scan for Limonene and other allergens automatically.
Safer Alternatives
These ingredients serve a similar function with lower allergy risk:
Frequently Asked Questions
Is Limonene safe for sensitive skin?
Limonene may cause reactions in some sensitive individuals. Patch testing is advisable.
What products contain Limonene?
Limonene is commonly found in all fragranced products, cleaning products.
What does Limonene do in cosmetics?
Limonene functions as a fragrance in formulations. Common fragrance allergen. Fresh limonene is not allergenic — it becomes allergenic after oxidation.
Related Guides
Top 10 Cosmetic Allergens
Is Limonene on the list? See the full clinical ranking.
Fragrance-Free Skincare Guide
Why fragrance is the #1 cause of cosmetic contact dermatitis.
How to Read Ingredient Labels
Decode INCI names and find hidden allergens in your products.
Find Your Skin Allergy Trigger
Step-by-step elimination method to identify your trigger.
Contact Dermatitis Guide
Symptoms, causes, patch testing, and treatment options.
Is Limonene causing YOUR skin reactions?
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