Guaiol (C15H26O) is a bicyclic sesquiterpene alcohol , a subclass of terpene carrying a hydroxyl group , with a molecular weight of 222.37 g/mol. It is formally classified under the guaiane sesquiterpene skeleton, sharing structural features with other plant-derived sesquiterpenes such as bulnesol. Its aroma profile is typically described as woody, earthy, and faintly floral, with some accounts noting a secondary rose-like or pine note depending on concentration and matrix.
The compound occurs naturally in the resin and heartwood of Bulnesia sarmientoi and related guaiac species, trees native to the Gran Chaco region of South America, where distilled guaiac wood oil has been used in perfumery since at least the early twentieth century. Guaiol is also detected in smaller concentrations across a range of other botanicals, including certain cultivars of Cannabis sativa, cypress pine, tea tree relatives, and some coniferous species. Its presence in cannabis-derived terpene profiles has drawn renewed analytical attention in recent years as full-spectrum botanical characterisation has become more routine.
In perfumery and flavour chemistry, guaiol is regarded as a relatively stable sesquiterpene at ambient temperatures. Unlike many monoterpenes, it does not oxidise rapidly on air exposure, which makes it a useful fixative note in formulation. Its odour threshold sits in the low-to-moderate range, meaning small concentrations are perceptible, though this varies considerably by medium.
Preliminary laboratory research has examined guaiol's interactions with various cell lines and biological assays. These studies remain at an early, exploratory stage , predominantly in vitro or in animal models; and no conclusions about effects in humans can be drawn from the current body of evidence. The compound is not approved as a therapeutic agent in Australia, and no regulatory body has assessed it as such. Any characterisation of biological activity in the published literature should be read strictly as mechanistic chemistry research, not as evidence of health benefit.
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