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Citral in skincare
Lemon-scented terpene aldehyde (mix of geranial + neral); found in citrus and lemongrass oils. EU-mandated allergen disclosure.
Found in both AM and PM scented products, particularly those containing lemongrass, lemon verbena, or citrus essential oils. PM leave-on products carry higher sensitization risk. Oxidizes over time to form more potent allergens. One of the EU 26 mandatory fragrance allergens.
What it is
Citral is a mixture of two geometric isomers. Geranial (citral A, trans-isomer) and neral (citral B, cis-isomer). Naturally occurring terpenoid aldehydes responsible for the characteristic lemon scent. Found abundantly in lemongrass oil (70–85%), lemon myrtle, litsea cubeba, and citrus peel oils. One of the 26 fragrance allergens requiring mandatory individual declaration under EU Cosmetics Regulation 1223/2009 Annex III if present above 0.001% in leave-on products or 0.01% in rinse-off products. Sensitization rate ~1–2%. Oxidizes to form allergenic hydroperoxides and epoxides, increasing allergenicity in aged or poorly stored products. A common hidden allergen in 'natural' and 'essential oil-based' cosmetics.
The facts
| Category | Terpene Fragrance Allergen (Aldehyde) |
| Typical use | Morning and evening |
| Concentration YARAI treats as a full dose | 1% |
| EU Cosmetics Regulation annex | III |
| EU status | restricted |
Why the amount matters, not just the presence
Most ingredient checkers tell you whether something is in the bottle. That is a smaller question than it sounds. Citral at 1% and citral at a trace level are not the same ingredient in any way that affects your skin.
An ingredient list is ordered by quantity, so position carries real information. YARAI reads that position and scores accordingly, which is why the same ingredient can land differently in two different products.
The honest limit: a list gives order, not percentages. Estimating concentration from position is an estimate. It is a better estimate than ignoring position, and it is still an estimate. We would rather tell you that than let a number look more certain than it is.
Regulatory status
EU CosIng Annex III restricted substance.
Common questions
What does citral do in a skincare product?
Lemon-scented terpene aldehyde (mix of geranial + neral); found in citrus and lemongrass oils. EU-mandated allergen disclosure.
How much citral should a product contain?
YARAI treats 1% as a full dose for this ingredient. Below that, the ingredient is present but is scored as contributing less. An ingredient list gives you the order of ingredients, not their percentages, so this is an estimate read from position rather than a measurement.
When should I use citral?
Found in both AM and PM scented products, particularly those containing lemongrass, lemon verbena, or citrus essential oils. PM leave-on products carry higher sensitization risk. Oxidizes over time to form more potent allergens. One of the EU 26 mandatory fragrance allergens.
Check your own products
Point your camera at a product. YARAI identifies it from the label, finds that product's full ingredient list from published sources, and scores it. No barcode and no box needed, which is how it handles imported and small-brand products.
Concern level, category and thresholds on this page are read directly from the same data the YARAI app scores with, so this page and the app cannot disagree. EU figures cite Regulation (EC) No 1223/2009. Last built 2026-09-09. Nothing here is medical advice.