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The invisible molecule. Iso E Super is a synthetic wood that some people can't smell at all - yet it lurks in an estimated 80% of all modern fragrances. The ultimate behind-the-scenes player.
Top: barely there, a whisper of woody warmth. Heart: velvety, cedar-like, abstract, an aura more than a note. Base: warm, smooth, skin-like, intermittently perceptible. Iso E Super doesn't announce itself, it makes you lean in.
Scent Evolution
Immediately
Immediately
Barely there, a woody, velvety, slightly cedary presence you sense more than smell
After a few hours
After a few hours
Warm, smooth, woody-amber glow. It seems to appear and disappear in waves
After a few days
After a few days
Remarkably persistent. The phantom-like quality continues, noticed by others even when you can't smell it
The Full Story
Iso E Super is one of the most influential synthetic molecules in contemporary perfumery, prized for its ability to create an aura of velvety, woody warmth that seems to hover around the wearer rather than project outward. Discovered in the 1970s by International Flavors and Fragrances (IFF), this sesquiterpene derivative has become one of the most widely used aroma chemicals in the industry.
What makes Iso E Super remarkable is its unusual perceptual behaviour. The molecule interacts with olfactory receptors in a flickering, intermittent way, wearers and those around them catch it in fleeting waves rather than as a constant presence. This creates an almost subliminal effect, a sense that something smells wonderful without being able to pinpoint exactly what. Perfumers describe it as giving compositions a three-dimensional quality, a sense of depth and radiance.
Chemically, Iso E Super is not a single compound but a mixture of isomers, the most olfactively important being the gamma isomer. It has a warm, cedarwood-like character with amber and slightly peppery facets, though describing it in conventional olfactory terms undersells its effect. It is less about what it smells like and more about what it does, smoothing rough edges, adding perceived quality, and creating an enveloping warmth.
The molecule's discovery that it could function as practically the sole ingredient in a fine fragrance, producing a magnetic, skin-scent effect beloved by many, was a watershed moment in perfumery. It demonstrated that a single well-chosen synthetic could rival complex natural accords in emotional impact.
In practice, Iso E Super is used in nearly every category of perfumery: fresh, floral, oriental, woody. It appears at concentrations ranging from trace amounts (for subtle enhancement) to dominant levels (where it becomes the composition's defining character). Its versatility, low cost, and remarkable effect on perceived quality make it arguably the single most important molecule in the modern perfumer's toolkit.
Fun Fact
Did you know?
About 20 % of the population cannot smell Iso E Super at all. For the rest it creates a 'phantom' woody aura that seems to hover around the skin without a clear source.
Technical Data
Molecular Formula
C₁₆H₂₆O
CAS Number
54464-57-2
Botanical Name
Synthetic (no botanical source)
Extraction
Chemical synthesis from ionone derivatives. Multiple isomer composition. Premium variants isolate the gamma isomer.
IFRA Status
Permitted with IFRA limits. Not classified as an EU fragrance allergen.
Synonyms
ISO E SUPER · ARBORONE · ORBITONE · TIMBERSILK
In Perfumery
Base note, booster, and structural backbone. Provides warmth, radiance, and a woody-amber base. Used at 5-30% of formula in most modern fragrances, or at 100% as a standalone molecule fragrance.
