What is it?
An essential oil pressed from the peel of the sweet orange, Citrus sinensis, which appears on labels as Citrus aurantium dulcis. It is more than 90 percent terpenes, mainly limonene, while aldehydes such as decanal and citral are important to its aroma. It scents skin care, soaps, hair products and household cleaners, and the same oil flavors drinks and sweets.
Key information
- Sweet orange oil is mostly limonene, which can oxidize in air into compounds that cause skin allergy more often.
- IFRA restricts expressed lemon, lime, grapefruit and bitter orange oils for phototoxicity, but not sweet orange oil.
- EU labels must name orange peel oil above 0.001 percent in leave-on or 0.01 percent in rinse-off products placed on the market after July 31, 2026.
- Orange peel oil is generally recognized as safe (GRAS) by the FDA as a food ingredient.
More information
Most sweet orange oil is cold-pressed from the fresh peel, and distilled versions are also sold. Besides limonene, samples reviewed by the EU’s Scientific Committee on Consumer Safety (SCCS) contained linalool, decanal and citral at under 1 percent each.
In 2014 the Cosmetic Ingredient Review (CIR) Expert Panel concluded that citrus peel oils, including sweet orange peel oil, are safe in cosmetics when formulated to be non-sensitizing and non-irritating, provided leave-on products contain no more than 15 ppm (0.0015 percent) of bergapten, a phototoxic furocoumarin. The Panel stressed non-irritating formulas partly because older mouse studies found that repeated, irritating doses of citrus oils promoted skin tumors started by a chemical carcinogen.
Phototoxicity, a sunburn-like reaction, comes from furocoumarins. An EU scientific committee noted in 2005 that cold-pressed citrus oils generally contain high levels and would need to be distilled to bring them below 1 ppm. Sweet orange oil is not among the citrus oils IFRA restricts for this reason. Cold-pressed orange oil was not phototoxic in animal tests reviewed by CIR, though one small human study saw reactions in three of five volunteers at 1 percent under UVA light and none at 0.1 percent. Distilled orange oil carries even less of this risk.
The SCCS classifies expressed sweet orange peel oil as an established contact allergen, though positive patch tests are uncommon: 0.2 percent of 6,246 patients in one large study. Much of the concern is limonene, which rarely causes reactions when fresh but oxidizes in air into compounds that frequently do; EU rules and IFRA standards set a peroxide limit for it. On EU labels, orange peel oil now appears as “Citrus Aurantium Peel Oil,” alongside limonene, linalool and citral. Keeping products tightly closed limits oxidation.
Sources: CIR: Safety Assessment of Citrus-Derived Peel Oils as Used in Cosmetics (2014); SCCS: Opinion on fragrance allergens in cosmetic products (2012); SCCP: Opinion on furocoumarins in cosmetic products (2005); Official Journal of the EU: Commission Regulation (EU) 2023/1545 on labelling of fragrance allergens
