What is Fragrance Mix II?
Fragrance Mix II (FM II) is a standardized patch test preparation that complements Fragrance Mix I by screening for six fragrance allergens not included in the original FM I panel. It was developed in the early 2000s as contact dermatology researchers recognized that FM I — while excellent — was missing a significant number of clinically relevant fragrance reactions. FM II was validated and incorporated into European and American standard patch test series around 2005–2008.
The six components of Fragrance Mix II are:
- Lyral (HICC) — Hydroxyisohexyl 3-cyclohexene carboxaldehyde; synthetic muguet (lily of the valley) fragrance; banned in EU cosmetics since 2019
- Citral — Lemon-scented compound found in citrus oils, lemongrass, and many essential oils
- Farnesol — Naturally occurring in multiple flowers; widely used in fine fragrance
- Citronellol — Rose-scented compound in geranium and citrus oils
- Hexyl Cinnamal — Synthetic jasmine-like fragrance; EU-regulated allergen
- Coumarin — Tonka bean-derived fragrance with sweet, hay-like scent; EU-regulated
Together, FM I and FM II cover most of the important fragrance allergens identified in contact dermatitis databases, though fragrance allergy testing continues to evolve as new ingredients enter the market.
Why does Fragrance Mix II cause reactions?
Like FM I allergens, FM II components sensitize through Type IV delayed hypersensitivity after penetrating the skin barrier and forming protein conjugates. Each FM II component has its own specific chemistry but shares the key property of being a reactive molecule capable of hapten formation.
Lyral (HICC) is particularly notable because it was, at the time of its regulatory restriction, considered one of the most common fragrance allergens in Europe — affecting up to 3% of the general population and over 10% of contact dermatitis patients. Its restriction and subsequent ban from EU cosmetics in 2019 reflects the severity of the problem.
Citral is relevant not just in synthetic fragrances but in natural essential oils — it is a major component of lemon oil, lemongrass oil, and citronella oil, which are commonly used in "natural" skincare and aromatherapy products.
Who is at risk?
- Those already sensitive to FM I components (dual positivity to FM I and II is common)
- Users of "natural" aromatherapy or essential oil products (citral-containing oils)
- Those who have reacted to older perfume formulations containing lyral
Where is Fragrance Mix II relevant in products?
FM II allergens are found in:
- Fine fragrances and eau de parfum: Lyral, farnesol, and hexyl cinnamal are common in classic perfume compositions
- Citrus-scented products: Citral is ubiquitous in lemon, lime, and grapefruit-scented skincare
- "Natural" aromatherapy products: Citral in lemongrass oil, citronellol in rose oil
- Deodorants: Farnesol has antimicrobial properties and is used in some deodorant formulations
- Hair care with floral scents: Hexyl cinnamal in shampoos and conditioners
How to spot Fragrance Mix II allergens on labels
EU-regulated FM II components must be declared individually on cosmetic labels when above threshold levels:
- Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde — lyral (increasingly rare as brands reformulate)
- Citral — look for "Citral"
- Farnesol — look for "Farnesol"
- Citronellol — look for "Citronellol"
- Hexyl Cinnamal — look for "Hexyl Cinnamal"
- Coumarin — look for "Coumarin"
These names also appear when they are present as components of plant extracts or essential oils (e.g., lemongrass oil contains citral, which may or may not be separately declared depending on regulatory context).
In Indian products 🇮🇳
FM II allergens are present across Indian cosmetics and personal care products. Citral is particularly common in Indian market products because lemon, lime, and lemongrass scents are widely used in soaps, hand washes, and body lotions popular in India. Brands like Hamam, Dettol (citrus variants), and many lemon-scented body wash products from HUL and P&G contain citral.
Farnesol appears in some Indian deodorants and roll-ons. Coumarin — with its sweet, tonka-like scent — appears in many Indian perfumes and colonges.
For Indian dermatology patients testing positive for FM II, particularly citral, the avoidance list should include all citrus-scented and lemongrass-scented products in addition to obviously fragranced cosmetics.
Safer alternatives
- Fragrance-free, dye-free formulations: The same fragrance-free brands recommended for FM I allergy apply here
- Citral-free citrus alternatives: Some fragrance-free brands offer citrus-like fresh scents from non-allergenic aromatic compounds
- Unscented laundry and household products: Reduces airborne fragrance exposure
- EU-compliant reformulated fragrances: Since lyral is banned in the EU, products labeled for EU markets will not contain it; check product region