Castoreum is a natural aromatic substance derived from the castor sacs of beavers, primarily used in perfumery for its rich, animalic, and leathery scent profile. It is often employed as a base note in fragrances, contributing depth and warmth to compositions, particularly in oriental and woody accords. Castoreum can enhance the complexity of a fragrance by adding a unique, musky character that is difficult to replicate with synthetic materials. In terms of usage, it typically sits alongside other base notes such as amber, musk, and various woods, helping to create a well-rounded and lasting scent. However, due to its animal origin, castoreum is subject to ethical considerations and regulatory scrutiny. It is important for perfumers to be aware of the sourcing practices and potential allergens associated with this ingredient. While castoreum itself is not commonly listed as an allergen, its use may be restricted under certain regulations, and it is advisable to consult the latest IFRA guidelines when formulating with this material. — AI-generated summary, 2026-09-02.
Deep, warm, and intensely animalic with a smoky-leathery character and a birch-tar-like phenolic edge. Underneath sits a sweet, resinous, almost fruity balsamic warmth that softens over time into a suede-like, powdery-musky drydown.AI · claude-opus-4-7
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Perfume and Flavor Materials of Natural Origin, page 100.
Canadian castoreum is pear-shaped, wrinkled on the surface, somewhat flat, 5 to 17 cms long, 2 to 5 cms wide. Siberian castoreum is egg-shaped and smooth on the surface, almost the same size as Canadian castoreum, but not flat.
The above mentioned alcohol-resinoid is not a true absolute and it is not clearly soluble in cold alcohol. It can be prepared in a way that will cause it to be fairly soluble (chilling before evaporation).
Its warm, animal, leather-like sweet odor makes it an interesting item in men’s perfumes, fougères, chypres, Oriental bases, leather notes, tabac bases, etc.
In flavor work, it has long been known that castoreum extracts or tinctures were useful in vanilla flavor compounds.
Castoreum is used extensively in perfumery in the form of various processed materials: Tincture, Resinoid, Absolute.
One very well known vanilla specialty from a European house reveals this quite perceptibly. Conversely, vanilla extracts can be used to smooth down the coarseness of higher concentrations of castoreum products in fougères, leather bases, etc.
Castoreum is collected in Canada (Hudson Bay in particular) and in the U.S.S.R. (Siberia, etc.).