Geraniol (C10H18O) is a naturally occurring monoterpene alcohol with a molecular weight of 154.25 g/mol. Structurally, it is the geometric isomer of nerol, differing only in the configuration around its double bond. It is produced via the mevalonate pathway in plant trichomes and secretory cells, and is a key intermediate in the biosynthesis of other monoterpenes including linalool and citronellol. Its odour profile , simultaneously rosy, citrus-edged, and faintly sweet , makes it one of the most widely used reference compounds in flavour and fragrance classification.
In nature, geraniol is found at appreciable concentrations in the essential oils of rose (Rosa spp.), palmarosa (Cymbopogon martinii), lemon myrtle (Backhousia citriodora), sweet basil (Ocimum basilicum), and coriander (Coriandrum sativum), among many others. It also occurs in the wax glands of honeybees, where it is secreted by the Nasonov gland and functions as a pheromone that guides workers to food sources and hive openings. This dual botanical and zoological presence makes geraniol a relatively well-studied compound in chemical ecology.
Within cannabis and hemp phytochemistry, geraniol is classified as a minor terpene. It is detected at low concentrations in certain cultivar profiles, typically overshadowed in abundance by myrcene, limonene, or pinene, but it contributes to the overall aromatic complexity of the plant. Geraniol is one of the terpenes included in the expanding research literature on cannabis terpene profiling, though its concentrations in most cultivars remain at the trace-to-minor level.
Laboratory studies have examined geraniol's interactions with insect olfactory systems, its role as a plant-defence volatile, and a range of preliminary in-vitro biological assays. This early-stage research is largely cell-based or animal-model work; no conclusions about effects in humans should be drawn from it, and geraniol is not approved or indicated for any therapeutic use in Australia. It is classified as generally recognised as safe (GRAS) as a food flavouring by international bodies, and appears on the International Fragrance Association (IFRA) ingredient lists, which govern its use in cosmetic and fragrance applications.
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