Ingredient library
Every ingredient SkinAtlas knows about — all 2165 of them. What each one does, what it works well with, and what to watch for.
Cinnamaldehyde — the primary aromatic compound of cinnamon oil. Provides a warm, sweet cinnamon fragrance. Listed as a significant fragrance allergen under EU Cosmetics Regulation.
Essential oil from the bark of Cinnamomum camphora (camphor tree). Contains camphor, linalool, and eucalyptol. Used at trace levels in sunscreen and outdoor formulas for its fresh, cooling scent and minor antimicrobial contribution. A known fragrance allergen requiring caution.
An essential oil steam-distilled from the wood of Cinnamomum camphora var. linaloolifera (ho wood), consisting mainly of linalool; used as a natural fragrance in cosmetics.
Steam-distilled essential oil from the bark of Ceylon cinnamon (Cinnamomum zeylanicum / C. verum), containing approximately 60–80% trans-cinnamaldehyde and 5–10% eugenol. Used solely as a fragrance ingredient. HIGH sensitization risk: cinnamaldehyde is a direct-acting electrophilic sensitizer (Michael acceptor), a Category 1 contact allergen on the EU fragrance allergen list, and one of the most frequently positive reactions in patch-test populations. Both cinnamaldehyde and eugenol must be individually declared on EU cosmetics above threshold concentrations, and the whole oil is now itself listed in EU Regulation 2023/1545 Annex III (effective July 2026 for new products).
A naturally occurring fragrance alcohol with a floral, balsamic character, found in cinnamon and storax essential oils. Listed as a regulated fragrance allergen under EU Cosmetics Regulation.
A naturally occurring citrus-scented aldehyde (mixture of geranial and neral) that is a regulated EU fragrance allergen found in citrus and lemongrass oils.
Essential oil distilled from Cymbopogon nardus (citronella grass). Primarily used as a fragrance ingredient; contains significant concentrations of citronellal, geraniol, and citronellol — all EU-listed fragrance allergens.
A rose-like fragrance component and known allergen.
An essential oil expressed or steam-distilled from the peel of lime (Citrus aurantifolia) used primarily as a fragrance ingredient; the cold-pressed form contains furanocoumarins that are phototoxic in leave-on applications.
Cold-pressed essential oil from the peel of Citrus aurantium amara (bitter orange). Used as a natural fragrance ingredient in prestige cosmetics. The peel oil has a brighter, more citrusy character than the flower-derived neroli.
The essential oil steam-distilled from bitter orange (Citrus aurantium amara) flowers, known as neroli, used primarily as a luxury natural fragrance in cosmetics.
An essential oil cold-pressed from bergamot orange fruit rind, used as a natural fragrance ingredient with a distinctive citrus-floral-spicy scent.
Sweet orange peel essential oil, used primarily as a natural fragrance in cosmetics; contains limonene and may cause sensitization or phototoxicity in some users.
The essential oil from sweet orange (Citrus aurantium dulcis) flowers, used as a natural fragrance ingredient distinct from sweet orange peel oil.
An essential oil cold-pressed from grapefruit peel, used primarily as a natural fragrance ingredient with a fresh, tart citrus scent.
Cold-pressed essential oil from the peel of Citrus junos (yuzu), a citrus fruit widely cultivated in East Asia. Composed primarily of d-limonene (63–92%) and γ-terpinene; furanocoumarins (bergapten) are below detection limit (<0.1 ppm) in commercial cold-pressed yuzu peel oil — well under the 15 ppm cosmetic safety threshold — so phototoxicity is not a concern. Primary allergen risk is limonene, which is an EU-regulated fragrance allergen under Regulation 2023/1545 and must be declared on leave-on products above 0.001%. Vitamin C and brightening benefits associated with yuzu belong to aqueous yuzu fruit extract forms, not this essential oil.
Cold-pressed or steam-distilled essential oil from lemon (Citrus limon) peel, composed primarily of limonene (up to ~96%) with citral and furocoumarins; used for fragrance but carries phototoxicity and fragrance sensitization risks requiring careful formulation controls.
Cold-pressed essential oil from Citrus medica limonum (lemon) fruit — an older INCI designation corresponding to the current Citrus Limon; the same oil is also sold as 'lemon peel oil'. Predominantly d-limonene (~70%) with beta-pinene, gamma-terpinene, and trace citral. Unlike yuzu peel oil, cold-pressed lemon oil retains furanocoumarins (bergapten) at phototoxically relevant concentrations, making it a photosensitizer in leave-on formulas. Primarily used as a fragrance ingredient in cosmetics.
The essential oil expressed or distilled from mandarin orange (Citrus nobilis) peel, used as a natural fragrance ingredient in cosmetics.
A cold-pressed essential oil from grapefruit (Citrus paradisi) peel, used mainly as a fragrance ingredient; contains furanocoumarins that confer phototoxicity risk in leave-on products exposed to UV, though FCF (furanocoumarin-free) versions are available for safer daytime use.
An essential oil cold-pressed from tangerine peel, used primarily as a natural fragrance ingredient with a sweet, fresh citrus scent.
An oleoresin collected from Copaifera officinalis trees (South America), registered in EU CosIng (Ref 75473), used in cosmetics as a fragrance and film-forming ingredient; rich in sesquiterpenes including beta-caryophyllene and diterpene acids.
A naturally occurring and synthetic aromatic lactone with a sweet, vanilla-hay scent; one of the 26 EU-mandated declarable fragrance allergens in cosmetic products.
Essential oil steam-distilled from Cymbopogon citratus (West Indian lemongrass) leaves. Distinct from Cymbopogon Schoenanthus (camel grass) and Cymbopogon Nardus (citronella). Composed primarily of citral (~75–80%, as a mixture of geranial and neral), with geraniol, nerol, and myrcene as minor constituents. The high citral content makes it one of the most potent fragrance allergen contributors in essential oil-containing formulas.