Since the dawn of civilization, man has been a perfumed creature. Whether it was to improve the scent of our surroundings, to please the gods, or simply to mask unpleasant body odors, perfume has constantly woven itself into our history. Among the many components that have shaped this art, some of the most fascinating are the bizarre ingredients that perfumers have daringly employed.
Bizarre Ingredients That Changed Perfume
1 Tonquin Deer Musk
We kick off with the least noxious‑smelling of the lot: tonquin deer musk. Certain male deer sport pods between their legs that they spray to attract females. Humans have prized this musk for over a millennium, discovering that it prolongs the scent of a perfume.
While the pods can be harvested without killing the animal, it is far easier to obtain them from a dead deer. The ingredient was so coveted that it appeared in virtually every perfume until the 1970s, when CITES finally restricted its trade. It also found a place as a food additive.
In its raw form the odor is far from pleasant, but extreme dilution turns it into a subtle floral‑sensual note. Historically it was used at dilutions of 3 % or less as a fixative, though some formulations relied on larger amounts. Notably, the original Chanel No 5 was formulated with about 15 % deer musk tincture alongside 15 % civet tincture, making it a decidedly skanky beast compared to today’s light floral version. Original bottles now fetch high prices on eBay.
2 Castoreum
Next up is castoreum, a secretion harvested from the castor sacs of beavers, which sit beside their anal sacs. Beavers use it to mark territory, and perfumers classify it as a musk.
The scent offers a pleasant wood‑and‑leather aroma, a note that was hard to replicate before modern chemistry. Although most contemporary perfumes exclude it, luxury houses still value it for its natural leather quality, often blending it with synthetic notes.
Francois Coty’s famed L’Origan (1908) contained a hefty 0.5 % of pure castoreum, acting as both fixative and scent component. Like many historic formulas, it has been reformulated for safety and PR friendliness, meaning you’d need to hunt down an original on eBay to experience it. Interestingly, castoreum also flavors strawberry and raspberry foods, so you may have inhaled it on your skin and tasted it on your plate.
3 Dimethyl Sulfide
Dimethyl sulfide (DMS) is one of the most potent chemicals in perfumery, delivering a sharp, sulfur‑onion aroma. Naturally it appears in onions, asparagus, durian fruit, and the dead‑horse arum lily, yet paradoxically it also resides in roses and geraniums.
Perfumers employ DMS to boost the rosiness of geranium oil, craft a more authentic rose base, and even recreate the breezy scent of the seaside, as the compound is naturally present in coastal air. It should not be confused with dimethyl sulfate, a toxic chemical used in warfare.
4 Costus Oil
Costus oil, now largely banned, was once a staple of classic perfumery, featuring in celebrated men’s fragrances like Aramis and Patou Pour Homme. Its decline stems from endangered status in its native India and debates over its sensitizing properties.
The oil smells strikingly like wet dog hair—far from a crowd‑pleaser even in dilution. When artfully combined with other animal‑derived ingredients such as castoreum and civet, costus oil contributes a surprisingly fresh note of unripe melons and iris flowers, a combination difficult to achieve with purely natural extracts.
Synthetic alternatives now exist, though none fully capture the intricate character of the natural oil.
5 Phenols
Phenols comprise a sizable family produced by plants as a defense against insects. The most common perfumery phenols are cresols, originally synthesized from creosote, a coal‑tar by‑product.
These compounds emit a distinctive creosote‑like odor, reminiscent of a strong commercial cleaner, and many also echo the scent of horse or human urine due to para‑cresol content.
Despite the seemingly odd aroma, phenols are vital for recreating certain floral scents such as jonquils, ylang‑ylang, lilac, and hyacinth. Virtually every perfume contains some phenols, either added synthetically or present naturally in floral oils like jasmine. Notably, salicylic acid—the active component of aspirin—is also a phenol.
6 Ambergris
Ambergris is an intestinal secretion from sperm whales. While scientists still debate which end of the animal expels it, perfumery‑grade ambergris must have floated in the ocean for years. Fresh ambergris smells downright foul; only after prolonged aging does it develop a softer, slightly floral character.
Its primary role in perfume is as a fixative—just a single drop can extend a fragrance’s longevity for days. Historically, it was added to nearly every perfume, but today its use is limited by astronomical price tags ranging from $26 000 per kilogram upward, as most ambergris is discovered by chance on distant beaches.
Beyond fragrance, ambergris once flavored gourmet dishes; King Charles II famously enjoyed it with scrambled eggs.
7 Indole
Indole, naturally present in many white flowers such as orange blossom, jasmine, and lilies, carries a powerful fecal odor. In perfumery, it is indispensable for adding realism to floral compositions; a synthetic jasmine base will never truly smell like jasmine without a dash of indole.
Modern minimalist scents sometimes use indole on its own to evoke a pure jasmine note. Fascinatingly, indoles are derived from chemicals resembling serotonin, which interacts with brain receptors to produce pleasure. LSD, for instance, is an indole alkaloid, explaining its psychoactive allure. Of course, simply inhaling a bouquet of jasmine offers the same pleasure without the psychedelic side effects.
8 Civet Musk
Civet musk is a thick secretion from the glands of the civet cat, most commonly sourced from farmed animals in Ethiopia. In its raw form the odor is putrid and intensely powerful, but extreme dilution transforms it into a unique, appealing floral‑animalic bouquet.
This ingredient featured heavily in historic formulas—Francois Coty’s Chypre contained 1 % civet, and the original Chanel No 5 also employed it. While luxury houses still retain natural civet in some creations, mainstream perfumery either omits it or substitutes synthetic analogues, as seen in Guerlain’s Jicky.
Historically, civet paste was sometimes adulterated with honey or even human baby excrement to boost profit, and purity was traditionally verified by a taste test.
9 Mercaptans
Mercaptans are a notorious family of sulfur‑smelling chemicals, evoking the stench of rotting cabbage. Though all mercaptans share a powerful sulfur note, subtle variations exist: ribes mercaptan hints at black currant, while furfuryl mercaptan carries a coffee nuance.
Skilled perfumers temper the sulfuric edge while allowing these accent notes to shine. Mercaptans, like dimethyl sulfide, also appear in human flatulence. Their foul odor is so unmistakable that they are added to otherwise odorless natural gas to alert humans to leaks.
10 Skatole
Skatole is the ultimate odorous paradox: it is the pure essence of poop, found in feces and coal tar, and is utterly repulsive even when heavily diluted. Yet when blended with other compounds, skatole can metamorphose into a delicate floral scent.
Though part of the indole family, its sheer vileness earns it a standalone spot on this list. Minute traces of skatole appear in many blossoms, including jasmine and orange blossom, where it partners with indole to impart a potent, erogenous undertone.
The most celebrated perfume featuring skatole is Maurice Schaller’s Nuit de Chine (1913) for Les Parfums de Rosine—a fougère built around sandalwood, skatole, peach, and rose. The fragrance showcases skatole’s presence from the first whiff, yet balances it so exquisitely that the scent remains irresistibly captivating.
11 Competition
It’s been ages since I ran a competition, so here’s one for you! I’ve been dabbling in perfumery and have sourced high‑quality samples of every ingredient discussed above, all compliant with international animal‑product regulations.
Reading about these fascinating substances is one thing, but experiencing them is another. To that end, we’ll send a small vial of each of the ten ingredients to three lucky participants—ten vials each.
The prize goes to the three comments that garner the most up‑votes, so make your remarks interesting! Entries close 48 hours after this list is published, and the competition is open to readers of any age in every country.