Cyclopentasiloxane — Allergy Risk & Safety Profile
INCI: CYCLOPENTASILOXANE
Also known as: D5, Cyclopentasiloxane
Key Facts
- CAS Number
- 541-02-6
- Category
- emollient
- Risk Level
- low
- Common Allergen
- No
- EU Status
- Restricted
- Max Concentration
- EU restricted in wash-off products
- Found In
- primer, foundation, hair serum
Is Cyclopentasiloxane safe in cosmetics?
Cyclopentasiloxane is rated low risk in cosmetic products. It is not classified as a common allergen and is generally well-tolerated by most skin types. This ingredient is restricted under EU cosmetic regulations. Safer alternatives include Squalane, Jojoba Oil, Shea Butter. Commonly found in primer, foundation, hair serum.
What is Cyclopentasiloxane?
Lightweight volatile silicone. EU restricted due to environmental persistence concerns, not safety.
Allergy & Safety Information
Cyclopentasiloxane is considered safe for cosmetic use. No significant safety concerns have been identified at typical use concentrations. As with any cosmetic ingredient, discontinue use if irritation occurs.
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 Cyclopentasiloxane: 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 Cyclopentasiloxane 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 Cyclopentasiloxane, 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: Primer, Foundation, Hair serum. These product categories are the most common sources of Cyclopentasiloxane exposure based on formulation data.
Not sure if your products contain Cyclopentasiloxane? Paste the ingredient list into the free ingredient checker to scan for Cyclopentasiloxane and other allergens automatically.
Safer Alternatives
These ingredients serve a similar function with lower allergy risk:
Frequently Asked Questions
Is Cyclopentasiloxane safe for sensitive skin?
Cyclopentasiloxane is generally well-tolerated, even by sensitive skin types.
What products contain Cyclopentasiloxane?
Cyclopentasiloxane is commonly found in primer, foundation, hair serum.
What does Cyclopentasiloxane do in cosmetics?
Cyclopentasiloxane functions as a emollient in formulations.
Related Guides
Ceramide Moisturizers & Barrier Repair
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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 Cyclopentasiloxane causing YOUR skin reactions?
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