Fragrance ingredient
Boswellia Carterii Oil
A steam-distilled essential oil from the resin of the Boswellia carterii tree (East African / Somali frankincense), composed primarily of monoterpenes including α-pinene (24–46%) and limonene (8–26%). Used in cosmetics principally for its distinctive woody-balsamic frankincense fragrance. Important distinction from Boswellia Serrata Resin Extract: the steam-distilled oil does NOT contain boswellic acids (non-volatile triterpenoids that cannot pass over in distillation), so the anti-inflammatory activity associated with resin extracts is absent from this form. A 2021 case report documented allergic contact dermatitis from this oil.
Also known as: frankincense oil, olibanum oil, boswellia carterii (frankincense) oil
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Benefits
- ✓Adds characteristic frankincense fragrance to formulas
- ✓Mild skin conditioning from terpene constituents
- ✓In vitro antimicrobial properties noted in some studies
Watch for
- ⚠Documented contact allergen — allergic contact dermatitis case reported (Buonomo et al., Contact Dermatitis 2021)
- ⚠Contains limonene, an EU-declared fragrance allergen that must be labeled in EU cosmetics above threshold concentrations
- ⚠α-Pinene oxidizes on air exposure and becomes a sensitizer — requires fresh, well-stored material
- ⚠Does NOT contain boswellic acids — do not substitute for Boswellia Serrata Resin Extract when anti-inflammatory activity is needed
- ⚠IFRA usage guidelines limit leave-on concentrations (~0.5–2% typical) due to monoterpene sensitizer risk
