Ingredient guide

Essential Oils in Skincare: Natural Does Not Mean Non-Allergenic

Essential oils are popular and plant-derived, but they are among the more common skin sensitisers. Here's the honest picture for sensitive and eczema-prone skin.

What they are

Essential oils are concentrated aromatic extracts from plants, used both for scent and for claimed skin benefits. Because they are natural, they are often assumed to be gentler than synthetic ingredients. For sensitive skin, that assumption is the trap.

Natural is not the same as non-allergenic

Essential oils are complex mixtures that contain many of the same scent compounds covered elsewhere on this site, including limonene and linalool, which are declared fragrance allergens. Some, like tea tree and oxidised citrus oils, are well-recognised sensitisers. So “fragranced with essential oils” can be just as triggering as synthetic fragrance, sometimes more so.

Who tends to react

People with eczema, sensitive skin or existing fragrance allergy. Reactions are the delayed, itchy contact-dermatitis type, and can be stronger with oils that have oxidised in an older product.

A note on dermatitis-prone and baby skin

For eczema-prone and very young skin, dermatologists generally suggest fragrance-free over essential-oil-scented products, however natural the marketing sounds.

Where they hide

Natural and aromatherapy skincare, facial oils, balms, haircare and blemish treatments. Look for the plant name followed by oil or extract (for example Melaleuca alternifolia leaf oil for tea tree), plus the declared allergens like Limonene and Linalool.

Check products against your list

To check a product, SkinSAFE lets you filter a product catalogue to screen out essential oils in skincare and other allergens, and a free browser extension like Clearya flags ingredients of concern automatically as you shop online. These rate a product on general criteria rather than against your own list.

Once you know what you are screening for, a personal-list app like ClearaScan lets you save essential oils in skincare once and scan any product to flag only your triggers. It also keeps a Reaction Journal for flare-ups, a shared Care Circle so family or carers can scan for you, and a Trusted Products list for items you have cleared, and it is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)

More ingredient guides

Formaldehyde-Releasing Preservatives: The Hidden Allergen Group

Several common preservatives slowly release small amounts of formaldehyde. Here's what they are, why they matter for sensitive skin, and how to spot them.

Lanolin: The Wool-Derived Moisturiser That Some Skin Reacts To

Lanolin is a natural emollient from sheep's wool, brilliant for dry skin but an allergen for some. Here's what it is, who reacts, and the names it hides under.

Limonene: The Citrus Scent That's a Declared Allergen

Limonene gives products a fresh citrus note and is one of the 26 EU-declared fragrance allergens. Here's what it is, who reacts, and where to spot it.

Linalool: The Floral Fragrance Allergen Found Almost Everywhere

Linalool is a floral scent compound and one of the 26 declared fragrance allergens. Here's what it is, why it oxidises, and who tends to react.

A note on this content. The Sensitive Skin Lab publishes general educational information, not medical advice. If you suspect you have an allergy or sensitivity, consult a qualified dermatologist or allergist. Product formulations and labels change without notice, so always check the ingredients on the product itself.