Sandalwood Oil
A prized woody fragrance — and a contact allergen through its santalol compounds
INCISantalum Album Oil
- Category
- Botanical
- Risk level
- medium
- Key allergens
- α-santalol and β-santalol — the main sesquiterpene alcohols — are the sensitising compounds
- Concentration matters
- Neat/high-concentration application (e.g. undiluted attar) carries more sensitisation risk than dilute cosmetic use
- PIH consideration
- Reactions on deeper skin tones often leave post-inflammatory hyperpigmentation, so the mark can outlast the rash
Look for these names on ingredient lists
This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Allergic contact dermatitis from topical use
- Facial dermatitis from sandalwood skincare or perfume
- Post-inflammatory hyperpigmentation at reaction sites (esp. deeper skin tones)
- Perioral dermatitis from sandalwood-scented lip products
Top picks without Sandalwood Oil
Highly rated products whose ingredient lists don't include Sandalwood Oil.
As an Amazon Associate, AllerNote earns from qualifying purchases.
Always scan the actual label before use — formulations change.
What is sandalwood oil?
Sandalwood oil (INCI: Santalum Album Oil) is an essential oil steam-distilled from the heartwood of the East Indian sandalwood tree (Santalum album), now also cultivated in Australia and elsewhere. It's among the most prized natural fragrance materials in the world — warm, creamy, woody, sweet, remarkably stable and long-lasting.
Its dominant aromatic compounds are α-santalol (~40–55%) and β-santalol (~20–25%), two sesquiterpene alcohols responsible for both the characteristic scent and the allergenic potential. Because the fragrance and the allergens are the same molecules, you can't separate one from the other in the natural oil. Sandalwood appears in fine fragrance and attar, "natural" skincare and face oils, scented soaps, and incense.
Why it causes reactions
Sandalwood oil drives Type IV delayed hypersensitivity: α- and β-santalol carry hydroxyl groups and sesquiterpene structures that form haptens with skin proteins. Several practical points:
- Dose-dependence. Neat/high-concentration use (strong attar, undiluted oil) is riskier than dilute cosmetic formulation.
- Leave-on vs rinse-off. Face oils and perfumes that stay on the skin pose more risk than a quickly rinsed soap.
- Pigment aftermath. On medium-to-deep skin tones, the reaction often heals with post-inflammatory hyperpigmentation — a mark that outlasts the rash.
- Cross-reactivity. May cross-react with other sesquiterpene-alcohol-rich oils and woody fragrances.
Sandalwood is a good reminder that "I love this scent" and "this scent loves my skin" are different sentences. The very santalols that make it smell so good are the ones a sensitised immune system reacts to — so a synthetic sandalwood accord can sometimes be the friendlier choice. And on deeper skin tones especially, it''s worth caring about the lingering mark, not just the flare. — Snehal
Where it's found
- Fine fragrance and attar — sandalwood is a major woody base note.
- "Natural"/Ayurvedic skincare — face oils, creams, masks.
- Scented soaps.
- Incense, temple oils and aromatherapy (inhalation/contact).
On labels: Santalum Album Oil / Santalum Album (Sandalwood) Oil (East Indian); Australian sandalwood appears as Santalum Spicatum Wood Oil.
Safer alternatives
- Synthetic sandalwood accords — "sandalwood-scented" products built on molecules like Javanol or isoamyl salicylate have a different allergenicity profile and may be tolerated.
- Cedarwood — an alternative woody note (with its own, separate sensitisation potential).
- Fragrance-free formulations — the dependable route for confirmed sandalwood allergy.
- Extreme dilution — if you must use the oil, heavy dilution (well under 1%) in a carrier reduces, but doesn't remove, the allergen load.
The bottom line
Sandalwood oil is a beloved woody fragrance whose signature santalols are also its allergens — so the scent and the sensitivity come together. Risk rises with concentration and leave-on use, and on deeper skin tones a reaction can leave lasting pigmentation. If you react, a synthetic sandalwood accord or fragrance-free product is the safer swap, and patch testing confirms the cause.
Was this article helpful?
One tap tells us what to write more of. No account needed.
Is this ingredient in your products?
Scan any cosmetic product to check for Sandalwood Oil and 30+ other allergens instantly.