What is musk? Its source, scent and place in perfume

What is musk?

Musk is originally the name of a dark, intensely smelling secretion that collects in a gland under the belly of the male musk deer. In perfume, the word describes the warm, soft, skin-like family of scents that recalls this secretion, and the molecules that create it. The musk you smell in today's perfumes usually comes from a laboratory rather than an animal: a single synthetic molecule, an accord built from several musk molecules, or a small number of plant materials. The word “musk” in a note list therefore names a scent impression, not a raw material.

The word itself has travelled far. It is generally traced from the Persian mushk through Greek and Latin into European languages, and some dictionaries follow it back to a Sanskrit word referring to the shape of the gland. In Arabic the same word lives on as misk, and it appears in verse 26 of Surah Al-Mutaffifin in the Qur'an, where the end of the drink of paradise is described. That deep cultural place explains why musk is such a familiar scent name across the Middle East and Türkiye.

Where does musk come from?

Musk comes from the musk deer of the genus Moschus. Despite their name, these animals are not true deer; they belong to a separate family, Moschidae. They have no antlers, and the males have long, curved upper canine teeth. Musk is produced in a gland surrounding the male's genital organ and collects in a sac known as the musk pod. The dried contents of the pod were for centuries among the most valuable fragrance materials in the world.

That value came at a heavy cost to the animals. In the wild, the pod was historically taken mostly from deer that had been hunted. Today some musk deer species are classed as Endangered on the IUCN Red List. CITES, the convention that regulates international wildlife trade, places the populations of Afghanistan, Bhutan, India, Myanmar, Nepal and Pakistan in Appendix I, its strictest list, and all other populations in Appendix II. On farms in China, where breeding has continued since the early 1950s, musk can be taken from living animals, but this output remains small next to the demand from traditional medicine. Perfumery, for its part, has largely replaced natural deer musk with synthetic musks.

What does musk smell like?

Natural deer musk is described as sharp and animalic when concentrated; highly diluted, it leaves a warm, soft trace that resembles skin. Synthetic musks sit at different points along that range. Some suggest clean laundry and cotton, some are powdery and slightly sweet, and some carry a bright pear-like or floral tone. That is why two perfumes labelled “musky” may not resemble each other at all.

The shared role of musk in perfume is to give softness and continuity. Musk molecules are relatively large and evaporate slowly, so they are usually heard in the lower layer of a scent and in the trace that stays on skin for a long time. Musk can soften a sharp opening, bring flowers closer to the skin, or on its own create a “skin scent” that seems almost odourless but is noticeable up close. The fragrance pyramid model explains these layers, although musk can be perceptible from the first minute in some formulas.

Muscone: the odour molecule of musk

The substance that carries the characteristic smell of natural musk is muscone. In 1906 the German chemist Heinrich Walbaum isolated it from the musk pod. In 1926 the Croatian-born chemist Leopold Ružička worked out its structure and showed that it contains a large ring of 15 carbon atoms; the same year he described the 17-membered ring of civetone, which comes from the civet. The discovery of these large-ring structures was part of the work that led to Ružička's share of the 1939 Nobel Prize in Chemistry.

Knowing the structure of muscone opened the way to making the same scent without touching an animal. Today muscone and similar large-ring molecules can be synthesised in the laboratory. Plants make related molecules too: the oil from the seeds of Abelmoschus moschatus contains a large-ring lactone called ambrettolide. This plant musk is covered in detail on the ambrette note page. But plant sources are also costly and limited, so most of the musks in perfume are produced by synthesis.

What are the families of synthetic musk?

Synthetic musks fall into four families according to their chemical structure. The first is the nitro musks. The first commercial synthetic musk, obtained by Albert Baur in 1888, belonged to this type. Nitro musks were cheap and widespread for a long time but were largely abandoned over safety and environmental concerns. Musk ambrette is prohibited in EU cosmetics and also by IFRA; since 2014, musk xylene may be used in the EU only with a REACH authorisation; and musk ketone is subject to concentration limits.

The second family is the polycyclic musks. Molecules such as Galaxolide and Tonalide became very common in detergents, fabric softeners and soaps, and part of the “clean laundry” impression comes from that use. Because they persist in the environment, they have been measured in water and in wildlife. In the EU, Regulation 2023/1545 added Galaxolide to the substances that must be named on the label above certain thresholds.

The third family is the macrocyclic musks: large-ring ketones such as muscone and large-ring lactones such as ambrettolide or exaltolide. This is the family closest in structure to natural musks. The fourth is the alicyclic musks, which combine ring-shaped and linear parts; the first commercial example of this class came to market in 1990. A modern “musk accord” is often built from several molecules from these families used together. White musk and cashmere wood are two different interpretations of such accords.

Why can some people not smell certain musks?

Musk is one of the scents that varies most from person to person. A family study published in Nature in 1973 by Whissell-Buechy and Amoore showed that the inability to smell pentadecalactone, a macrocyclic musk, is inherited in families like a recessive trait. Being unable to smell one particular substance is called specific anosmia, and it does not mean that a person's sense of smell is weak in general.

In recent years the biological basis of this difference has become clearer. A study published in Current Biology in 2022 by Keiichi Yoshikawa and colleagues showed that the human odorant receptor OR5A2 responds to four different classes of musk. OR5AN1 had earlier been identified as a receptor that responds to muscone. Later genetic studies reported that some variants of these receptors markedly lower sensitivity to particular musks, while variants of OR4D6 reduce the perceived intensity of Galaxolide. The diagram below shows which musk family has been linked with which receptor.

These findings have a practical consequence. If a musk perfume seems almost odourless to you, it may not mean the product has “gone”; someone near you may smell it clearly. Perceiving one musk family weakly also does not mean you will miss the others. Your nose getting used to a scent can create a similar effect; you will find that distinction in why can't I smell my perfume.

What do black musk and white musk mean?

Products sold as “black musk” or “white musk”, especially in the Gulf countries and Türkiye, usually describe a style of scent rather than a specific raw material. There is no shared standard defining what these names contain; the same name can describe a resinous, woody, floral or clean blend from different producers. You cannot tell from the name alone whether a product really contains animal musk. Given the restrictions on international trade and the cost, it is more realistic to assume that most of these products are built with synthetic musk molecules.

The same caution applies to claims of “musk deer” or “natural musk”. Trade in real animal musk is subject to CITES permits, and a word on a label does not prove such a permit exists. For the scent, what matters is which side of musk a product carries: clean and cottony, powdery, or warm and animalic?

How should you test a musk note?

The best place to judge musk is on skin, because its effect often appears up close and over time. Apply the perfume to a clean, intact area, do not decide in the first minutes, and return to the spot after a while. If you smell nothing at all, ask someone to smell it up close; that is the simplest way to tell specific anosmia from a genuinely faint trace.

Trying a few musk styles side by side is also instructive. A musk that feels like clean laundry, a powdery musk and a plant musk such as ambrette share one word but rely on different molecules. Noting which one you smell and which one disappears on you is a more reliable guide for your next choice than the label. If you are curious about where musk sits in the production chain, how is perfume made explains step by step how natural extracts and synthetic molecules meet in one formula.