A phenylpropanoid with a warm, sweet, root-beer-like odour, found naturally in sassafras bark and Ocotea oils. Prohibited by IFRA and classified as a controlled precursor — now absent from modern perfumery.
The odour of safrole is unmistakably sweet and warm, with a particular candy-shop,root-beer-like character. There is nothing green or herbal about it: the dominant impression is a soft, slightly spicy, anisic sweetness underpinned by a woody-balsamic warmth. Compared to anise, safrole is less sharp and more rounded; compared to eugenol, it lacks the clove bite but shares that phenylpropanoid warmth.
Scent Evolution
On a smelling strip, safrole opens with an immediate, sweet, spicy burst — almost confectionery-like. Within minutes, the sweetness softens and a dry, woody undertone becomes apparent, similar to of freshly split sassafras bark. Over several hours, it settles into a quiet, woody-amber murmur. The overall impression is of medium tenacity.
Evolution over time
Immediately
Immediately
Sweet, spicy, root-beer burst — warm and confectionery-like
Safrole (5-allyl-1,3-benzodioxole, CAS 94-59-7) is a naturally occurring phenylpropanoid found principally in the root bark of sassafras (Sassafras albidum) and in the trunk wood of Ocotea pretiosa. Smaller quantities occur in nutmeg, cinnamon, basil, and black pepper. The compound was first isolated in 1869 by August Husemann from camphor oil, and its structure was confirmed in 1885 by J. F. Eijkman, who showed it was identical to shikimol from Japanese star anise.
History and Use
For most of the 19th and 20th centuries, sassafras oil — roughly 80–90% safrole by weight — was a commodity product. It flavoured root beer, chewing gum, and toothpaste, and appeared in soaps, perfumes, and pharmaceutical preparations. The US FDA banned safrole as a food additive in 1960 after rodent studies demonstrated hepatocarcinogenicity at high doses. The European Commission classifies it as genotoxic and carcinogenic.
Regulatory Status
IFRA prohibits safrole as a fragrance ingredient. It is also a UN Table I and US DEA List I controlled precursor, owing to its role as the principal starting material for the synthesis of MDMA (via isosafrole or via piperonal). Demand for illicit safrole has driven destructive harvesting of Cinnamomum parthenoxylon in the Cardamom Mountains of Cambodia.
Chemical Properties
Molecular formula: C₁₀H₁₀O₂, MW 162.19 g/mol. Colourless oily liquid (impure samples appear yellow). Density: 1.096 g/cm³. Melting point: 11 °C. Boiling point: 232–234 °C at 760 mmHg. Refractive index: 1.527–1.538 at 20 °C. Flash point: 97.8 °C (TCC).
Safrole gave root beer its original flavour until the FDA banned it in 1960. It is also a UN Table I controlled precursor — the principal starting material for MDMA synthesis — making it one of the very few fragrance-adjacent molecules that is simultaneously prohibited by perfumery regulators and narcotics agencies.
Extraction & Chemistry
Extraction method: Steam distillation of the root bark of Sassafras albidum or the trunk wood of Ocotea pretiosa. Crude sassafras oil typically contains 80–90% safrole by weight. The oil is dried over anhydrous calcium chloride, then vacuum-distilled at approximately 100 °C to isolate pure safrole. Commercial extraction from sassafras is no longer economically viable in most regions; illicit harvesting of Cinnamomum parthenoxylon in Southeast Asia remains an ongoing conservation concern.
Prohibited. IFRA bans safrole as a fragrance ingredient. Separately classified as a UN Table I and US DEA List I controlled precursor chemical due to its role in MDMA synthesis.
Safrole is a prohibited ingredient under IFRA standards and no longer used in contemporary use. Historically, it served as a heart-note modifier, contributing warm, sweet, root-beer-like tonality to spicy and amber compositions. Its characteristic arom a now survives only through safer analogues — heliotrop in (piperonal), itself originally synthesised from safrole, is the closest modern substitute. Safrole remains relevant as a precurs or molecule in fragrance chemistry rather than as a direct ingredient.
