Fragrance Mix I

What is Fragrance Mix I?

Fragrance Mix I (FM I) is not an ingredient — it's a standardised patch-test reagent: eight classic fragrance allergens blended at set concentrations in a petrolatum base. European dermatologists developed it in the 1970s so a single patch could screen for fragrance allergy instead of testing dozens of chemicals individually. It's the most common positive on baseline patch-test series.

The eight components (each with its own page here):

1. Cinnamal — cinnamon
2. Cinnamic (cinnamyl) alcohol — cinnamon bark
3. Eugenol — clove
4. Isoeugenol — clove/ylang-ylang
5. Geraniol — rose/geranium
6. Hydroxycitronellal — synthetic lily-of-the-valley
7. Amyl cinnamal — synthetic jasmine
8. Oak moss (Evernia prunastri) — lichen; one of the strongest fragrance allergens

FM I detects roughly 70–80% of clinically significant fragrance allergy.

Why these eight, and what a positive means

Fragrance chemicals are small, lipophilic molecules that penetrate skin, bind proteins, and drive Type IV delayed hypersensitivity. The eight were chosen to be structurally diverse — natural extracts, essential-oil components, and synthetics — so the mix screens broadly.

A positive FM I means you react to one or more of the eight. It doesn't say which (individual-component testing does that), but the practical response is the same: treat yourself as fragrance-allergic and go genuinely fragrance-free. Higher-risk groups include people layering many scented products, those with eczema/broken barriers, and people with occupational fragrance exposure.

Reading labels

On EU/INCI labels, most added scent hides under "Parfum"/"Fragrance," but the individually-labelled fragrance allergens — long known as "the 26," now expanded to roughly 80 under Regulation (EU) 2023/1545 — must be named above threshold. All eight FM I components are on that list, so a fragrance-allergic person can scan for them by name (e.g. Cinnamal, Eugenol, Geraniol, Evernia Prunastri Extract).

After a positive test

1. Go fragrance-free (verify the list — "unscented" can still contain masking fragrance).
2. Ask about FM II and oxidised linalool/limonene if FM I is negative but you clearly react.
3. Consider component testing to learn which allergen(s) are yours — useful if you want to keep some products.
4. Mind the non-obvious sources — laundry products, shampoo run-off, "natural"/essential-oil products.

The bottom line

Fragrance Mix I is the single most useful fragrance-allergy screen — eight classic allergens, one patch, ~70–80% detection. A positive is a clear signal to go fragrance-free; pairing it with FM II and (optionally) component testing fills in the rest of the picture.