Pale yellow to brownish amber viscous oil (EO); brownish amber semi-solid (absolute)
Odor Strength
Medium
Producing Countries
India, China, Pakistan
Pyramid
Base
Wet fur drying in sun. Scalp oil on a warm pillowcase. Costus root smells like the human body before soap existed — mammalian, earthy, hairy — then softens into roasted hazelnuts and dark cocoa.
First impact: warm, hairy, unmistakably animal. The smell of a wet dog drying in sun, of scalp oil on a pillowcase, of damp earth in a root cellar. Not sharp — heavy, greasy, enveloping. Temperature: warm, almost feverish.
After ten minutes, the animalic edge softens. A nutty creaminess surfaces — roasted hazelnuts, cocoa nibs, a faint orris-like powderiness from the lactones. Drier than civet, less sweet than musk, more earthy than castoreum. The texture is oily, clinging, with a waxy solidity that distinguishes it from lighter animalics.
On a blotter at 10% dilution, it persists for days. The residue is smooth, intimate, skin-like — the smell of a body rather than a perfume.
Evolution over time
Immediately
Immediately
Raw animal confrontation. Wet fur, human scalp warmed by sun, damp turned earth. Heavy, greasy, enveloping. The sesquiterpene lactones hit as a sharp, almost metallic edge beneath the warmth.
After a few hours
After a few hours
The aldehydes dissipate. What remains is creamy, nutty — roasted hazelnuts, cocoa nibs, a powdery orris-like smoothness. The animalic quality becomes intimate rather than aggressive. The waxy aplotaxene undertone anchors everything.
After a few days
After a few days
A persistent, smooth, skin-like residue. Warm, slightly sweet, profoundly tenacious. On fabric, it can last over two weeks. The smell of a lived-in garment rather than a perfume.
Terroir & Origins
Indicative 2025 wholesale prices.
The Full Story
Costus root oil comes from the dried rhizomes of Dolomiaea costus (Falc.) Kasana & A.K.Pandey — reclassified from Saussurea costus, syn. Saussurea lappa, syn. Aucklandia costus. A perennial thistle of the Asteraceae family, native to the subalpine valleys of the western Himalayas: Kashmir, Himachal Pradesh, Uttarakhand. It grows at 2,500–3,500 metres on steep, rocky slopes where snow covers the ground for months. The roots are thick, woody, tapered — dug by hand after the plant has flowered.
The smell is not for everyone. At full concentration, TGSC describes it as 'orris, green, hairy, woody, unripe melons.' That undersells the confrontation. First breath: wet fur, human scalp after a day in the sun, damp earth turned with a spade. There is something unmistakably mammalian — not fecal, not urinary, but the warm, greasy, hair-and-skin smell of a living animal. It is closer to the scent of a horse's neck than to any flower.
Then it changes. The sesquiterpene lactones — costunolide (CAS 553-21-9, C₁₅H₂₀O₂, MW 232.32) and dehydrocostus lactone (CAS 477-43-0, C₁₅H₁₈O₂, MW 230.31) — settle into something nutty, creamy, almost chocolatey. Aged costus absolute is considerably smoother than fresh oil: the lactones persist, the aldehydes burn off. Aplotaxene — (8Z,11Z,14Z)-heptadeca-1,8,11,14-tetraene, CAS 10482-53-8 — is a major constituent at approximately 20% of the oil, contributing a waxy, slightly fatty undertone. Other identified constituents include elemol, γ-costol, β-selinene, and α-ionone. A GC-MS study of cultivated Uttarakhand roots (Pharmacognosy Research, 2013) identified 41 components representing 92.81% of total composition, with (7Z,10Z,13Z)-hexadecatrienal (25.5%) and dehydrocostus lactone (16.7%) as dominant peaks.
In perfumery, costus is — or was — a fixative of extraordinary tenacity. TGSC records a substantivity of 316 hours at 100%. Used at trace levels, often below 0.1% of concentrate, it imparted a primal, skin-warm intimacy to compositions. It functioned as a bridge between clean florals and raw animalics, lending body without the fecal edge of civet or the sharp sweetness of musk. It was essential to certain orientals, chypres, and leather accords.
The word 'was' is deliberate. IFRA Standard 124 (Amendment 40, 2006) prohibits costus root oil, absolute, and concrete as fragrance ingredients due to severe contact sensitisation risk from its sesquiterpene lactones. The EU bans it outright. Simultaneously, Saussurea costus has been CITES Appendix I since 1985, uplisted from Appendix II (where it had sat since 1975) at CoP5 following India's proposal. The species is IUCN Critically Endangered — an observed decline of 70% in the decade before 1997. Legal perfumery use of natural costus is, for all practical purposes, extinct. Industry synthetic reconstitutions approximate the warm, greasy, animalic profile but lack the full lactone complexity of the natural.
This note in Première Peau. Simili Mirage · Doppel Dänçers. Sample all seven extraits in the Discovery Set.
Did You Know?
Did you know?
Pliny the Elder priced costus at 5½ denarii per pound in his Natural History (Book XII, Ch. 25, c. 77 CE) — roughly comparable to a day's wages for a Roman legionary. The Periplus of the Erythraean Sea (Section 39, mid-1st century CE) lists it among the exports of Barbarikon, the port at the mouth of the Indus, alongside nard, bdellium, lycium, turquoise, and lapis lazuli. Dioscorides, writing around 50–70 CE, distinguished three grades: white Arabian (best, light and pleasantly scented), black Indian, and Syrian (heavy, the colour of boxwood). The Sanskrit name kuṣṭha — meaning 'standing root' — predates all Greek and Latin references.
Extraction & Chemistry
Extraction method: Steam distillation of dried, ground roots of Dolomiaea costus (syn. Saussurea costus). Roots are typically dried and macerated in warm water before distillation. Reported yields vary widely: 0.3–1% under commercial conditions, as low as 0.02% (v/w) in controlled studies from Uttarakhand Himalayas. Solvent extraction yields costus root absolute — darker, thicker, considerably smoother, with reduced aldehydic aggression and enhanced lactone creaminess. CO2 supercritical extraction is also documented. The plant grows at 2,500–3,500m altitude in the western Himalayas (Kashmir, Himachal Pradesh, Uttarakhand). Cultivation began in the 1920s in response to over-harvesting. CITES Appendix I since 1985: international commercial trade in wild-harvested material is prohibited. Only documented cultivated material is legally available, and even that is now moot for perfumery given the IFRA prohibition.
Prohibited — IFRA Standard 124, Amendment 40 (2006): not to be used as a fragrance ingredient. Severe contact sensitiser due to sesquiterpene lactones (costunolide, dehydrocostus lactone). CAS scope: 8023-88-9, 90106-55-1.
Pale yellow to brownish amber viscous oil (EO); brownish amber semi-solid (absolute)
Flash Point
> 200.00 °F. TCC ( > 93.33 °C. )
In Perfumery
Base note fixative of extreme tenacity (TGSC: 316 hours substantivity at 100%). Used historically at trace concentrations — typically below 0.1% of concentrate — to add a primal, skin-warm quality to compositions. Costus does not mask; it reveals. It pulls clean florals toward the body, makes orientals smell worn rather than sprayed. Functionally: a fixative, an animalic modifier, and a volume builder. Its sesquiterpene lactones (costunolide, dehydrocostus lactone) provide both the raw animalic character and the creamy-nutty smoothness that emerges on dry-down. In chypre constructions, it replaced civet at the base. In leather accords, it reinforced birch tar without additional smokiness. In orientals, it provided the 'skin' that synthetic musks cannot. IFRA Standard 124 now prohibits all forms — oil, absolute, concrete — as fragrance ingredients. Industry-standard synthetic reconstitution bases approximate the warm, greasy profile but lack the full lactone complexity. Some perfumers use combinations of musk indanone (DPMI) and trace castoreum substitutes to reconstruct aspects of costus's animalic depth.
