Resins are produced across a wide range of plant families, most notably the Pinaceae (conifers), Burseraceae (frankincense and myrrh), and Dipterocarpaceae. They are chemically distinct from gums and mucilages: resins are largely insoluble in water but dissolve readily in alcohols, ether, and many organic solvents. Their composition is dominated by diterpene acids, triterpenes, and , depending on the species , variable proportions of essential oils, giving rise to the subcategory of oleoresins when a volatile fraction is present in significant quantity.
The biosynthesis of resin typically occurs within specialised secretory structures: resin canals, resin ducts, or secretory cavities embedded in bark, leaves, or reproductive tissues. When plant tissue is damaged, resin exudes rapidly, forming a viscous barrier that can impede herbivores and limit fungal or bacterial colonisation of the wound site. This ecological function has made resinous exudates an area of ongoing phytochemical study.
Historically, plant resins have held significant roles in medicine, trade, and material culture. Frankincense (Boswellia spp.) and myrrh (Commiphora spp.) appear in Ayurvedic, traditional Chinese, and ancient Egyptian records stretching back several millennia. In Western botanical tradition, resins including benzoin and balsam of Peru featured in pharmacopoeias through the 19th and well into the 20th century. In contemporary phytomedicine research, resinous fractions are classified and assessed according to their constituent compound classes; no therapeutic claim is implied by that classification alone.
Under the Australian regulatory framework, any product derived from or containing plant resins and presented for therapeutic use is subject to assessment by the Therapeutic Goods Administration (TGA) under the Therapeutic Goods Act 1989 (Cth). Listed medicines (AUST L) must meet evidence standards for the indications claimed; registered medicines (AUST R) require a higher evidentiary threshold. Raw resinous extracts intended for human use must comply with the relevant monograph standards and the TGA's permissible ingredients determinations.
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