Galaxolide is the trade name of a synthetic polycyclic musk molecule also known as HHCB. In perfume it is described as a clean, sweet, slightly floral and woody musk that reminds many people of freshly washed laundry. It is not a botanical note or an accord but a single molecule. Still, "musk" or "white musk" in a note list does not prove that Galaxolide in particular is in the formula.
What is Galaxolide?
PubChem lists Galaxolide as the compound 4,6,6,7,8,8-hexamethyl-1,3,4,7-tetrahydrocyclopenta[g]isochromene, formula C18H26O, CAS number 1222-05-5 (PubChem). "Galaxolide" is the trade name used for it by the fragrance company International Flavors & Fragrances (IFF) (Wikipedia). Scientific papers mostly use the abbreviation HHCB.
Peck and Hornbuckle (2006) write that polycyclic musks, HHCB among them, dominate the global musk fragrance market (review). The same review reports that polycyclic musk use grew while use of the older nitro musks declined.
Why does it smell like clean laundry?
Galaxolide is usually described as a clean, soapy, sweet, floral-woody musk. That is a sensory description. Much of the "clean laundry" comparison comes from habit: Peck and Hornbuckle (2006) note that synthetic musks are used to give soaps, detergents and other household and personal-care products pleasing scents (review). A smell met for years in such products comes to mean "clean".
That is why someone smelling Galaxolide may recognise it as detergent or fabric softener rather than as a perfume note. The association varies between people and cultures.
Galaxolide and the white-musk style
In perfume, "white musk" usually means a soft, clean, skin-close musk style; see the white musk note for the style itself. Galaxolide is one molecule that can build this style, but not the only way: other musk molecules and blends can give a similar "clean musk" impression.
Galaxolide belongs with synthetic molecules such as Iso E Super and ambroxan that shape a perfume's texture and are known by their own names. In a perfume such molecules usually work less as a stand-alone "note" than as a base supporting softness and diffusion. Dose and the other materials decide how noticeable it is.
Where do you meet it?
Galaxolide is one of the synthetic musks used both in perfumes and in everyday products such as detergents, softeners and soaps (review). A product label, however, usually says only "parfum" or "fragrance"; you cannot tell from it whether Galaxolide is present. The rule that a note name is not an ingredient list applies here too.
Discovery and structure of the molecule
According to its Wikipedia entry, Galaxolide was discovered at IFF in the 1960s by Heeringa and Beets, and was in use in fabric softeners and detergents by the late 1960s; the entry gives both 1956 and 1965 as the first synthesis, so no exact year is given here (entry). The same source says the material is a highly viscous liquid at room temperature and that the molecule has two chiral centres. Commercial Galaxolide is therefore not one form but a mixture of four stereoisomers.
That detail matters for smell. According to the entry, the (4S,7R) and (4S,7S) forms give the most powerful musk effect, with odour thresholds of 1 ng/L or less. In other words, what we call "the smell of Galaxolide" is the sum of forms that are not equally effective for the nose. Because the figure comes from a secondary source, read it as a general direction rather than a laboratory reference.
How to recognise it on paper and skin
Galaxolide alone is not a sharp smell; it is described as a clean, sweet, floral and woody musk. On a strip, it is more instructive to follow the soft, soapy trace left after the opening notes have gone than to focus on the first minutes. Perception of musks can vary from person to person, so "I smell nothing" may be an ordinary response and does not show the note list is wrong. Nor does smelling that cleanness show the molecule is Galaxolide, because other musk materials can give a similar impression.
Why regulators and researchers do not reach one answer
Assessments do not all point the same way. Wang and colleagues (2023) pooled worldwide data and reported that HHCB and tonalide are the most frequently detected synthetic musks, higher in western countries, with risk quotients below 0.1 in most waters and sediments (review). Su and colleagues (2023), using their own derived threshold (2.14 µg/L), calculated medium-to-high risk for HHCB, measured 20–2,620 ng/L in Guangzhou waterways and found low risk for the transformation product galaxolidone (study). Part of the difference comes from the chosen thresholds and regions.
In an April 2026 draft, the US Environmental Protection Agency preliminarily determined that HHCB does not pose unreasonable risk to human health or the environment under its TSCA conditions of use (Federal Register). This is a draft, and the same document places perfumes and cosmetics outside TSCA, so it should not be read as a safety ruling on perfume use. The Wikipedia entry also reports the EU classification H410, "very toxic to aquatic life with long lasting effects" (entry).
What is known about it in the environment?
Galaxolide's path into the environment is a question for everyday cleaning products as much as for perfume. Peck and Hornbuckle (2006) report that effluent from wastewater treatment plants is a major source of synthetic musks in the environment, and that HHCB largely leaves treatment plants with sludge rather than being broken down (review).
Risk assessments differ by region. Li and colleagues (2022) assessed the risk posed by HHCB and its close relative tonalide in sediment (study). They found medium-to-high risk in some regions but negligible risk in most sediments studied, and reported HHCB to be less toxic than tonalide. The authors recommend continued monitoring.
These findings concern aquatic environments; they say nothing about the safety of a perfume for human health.
