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Coumarin

Natural aromatic compound with a fresh hay scent. Occurs in sweet clover and tonka beans, on the EU list of 26 allergens.

Evidence by route

C

Topical application

EU mandates cosmetic labeling and limits food use. Rarely causes primary irritation, but sensitizes the skin.

How to read tiers A–F
  • CWeak evidence. In vitro data, open-label studies, or expert consensus

Tolerability and safety

Irritation potential
Medium
Allergen risk
High
Pregnancy
Caution
Suitable for
Normal, Dry, Oily, Combination
Use with caution
Sensitive

About this ingredient

Coumarin is a natural aromatic compound, a benzopyrone. Occurs in sweet clover, tonka beans, cinnamon, lavender. Scent – sweet fresh hay. In perfumery and cosmetics – a component of the fragrance composition. Regulatory status. The EU included coumarin in the list of 26 mandatory-declared fragrance allergens under Regulation 1223/2009. Manufacturers must list 'Coumarin' on the label if concentration exceeds 0.001% in leave-on products and 0.01% in rinse-off. From 2026 the EU allergen list has expanded to 80+ entries; coumarin remains on it. Allergy mechanism. Coumarin and its metabolites can trigger allergic contact dermatitis in predisposed patients. According to the European Environmental and Contact Dermatitis Research Group (EECDRG), sensitization is about 0.5-2% in patients suspected of fragrance allergy. Where applied. Perfumery (base of oriental and amber compositions), scented decorative cosmetics, body creams, fragranced hair products, shaving products. In Spain – present in most mass-market perfumes, including niche compositions by Loewe, Carolina Herrera. Safety and controversies. SCCS in 2015 confirmed that coumarin is safe in cosmetics with mandatory declaration. Systemically, high oral doses are hepatotoxic (hence the US food ban), but topical application doesn't reach toxic concentrations. Pregnancy and lactation – use with caution. No direct ban, but with sensitive skin and a tendency to allergies, avoid. 'Fragrance-free' alternatives are available. Best suited to: healthy skin without a tendency to fragrance allergies. Not for atopy, eczema, or a history of contact dermatitis. When choosing a face cream, check the label for 'Coumarin' – especially with sensitive skin.

Frequently asked questions

Is Coumarin safe during pregnancy?

Coumarin should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.

What skin types is Coumarin for?

Coumarin suits: normal, dry, oily, combination. Use with caution in: sensitive.

Can Coumarin irritate the skin?

Coumarin has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.

Can Coumarin cause an allergic reaction?

Coumarin has high allergen potential. Perform a patch test on the inner forearm 24 hours before facial application.

What is Coumarin and what does it do in cosmetics?

Natural aromatic compound with a fresh hay scent.

What's the INCI name for Coumarin?

The INCI name is Coumarin. It may also appear as: 2H-1-Benzopyran-2-One.

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