By Kershen Teo, founder and natural perfumer of Prosody London
As a perfumer who formulates exclusively from botanical ingredients, I am asked this question more than almost any other: does perfume cause cancer? My answer is honest — the science does not support a definitive yes, but it raises enough specific questions about synthetic fragrance ingredients that the precautionary case for natural perfumery has never been stronger.
This article covers what peer-reviewed research actually shows about fragrance chemicals, endocrine disruption, and carcinogenic risk. It is not alarmist — most mainstream fragrances are used safely by millions of people. But if you apply perfume to your skin every day, understanding what the ingredients are and what the science says about them is a reasonable thing to want.
I will also explain why I made the specific formulation choices I did when building Prosody London — and what avoiding synthetic musks, phthalates, and compounds like Iso E Super actually means in practice.
How Perfumes Are Formulated
Most mainstream fragrances contain a mixture of synthetic aromatic molecules designed to produce layered scent profiles with consistent performance and longevity. These typically include synthetic musks such as galaxolide and tonalide; phthalates used as fixatives and solvents; volatile organic compounds; UV stabilisers; and in some cases, natural essential oil components.
Some of these ingredients have been studied extensively for their biological behaviour — which is what leads people to ask whether long-term exposure contributes to health outcomes. The honest answer requires separating the cancer question from the endocrine disruption question, because these are frequently conflated and the evidence for each is different.
Synthetic Musks: Bioaccumulation Is the Core Concern
Synthetic musks — principally galaxolide (HHCB) and tonalide (AHTN) — are among the most widely used fragrance fixatives in mainstream perfumery. They provide the smooth, skin-close warmth and projection that defines many commercial fragrances. They are also among the most studied synthetic fragrance ingredients for environmental and biological persistence.
Research published in PMC confirms that galaxolide and tonalide bioaccumulate in fatty tissues, with levels detected at concentrations of up to 0.44 micrograms per gram in human breast milk. PubMed Central Multiple PubMed studies screening breast milk samples across China found HHCB, AHTN, and OTNE consistently present across provinces, with concentrations directly correlated with the use of personal care products including fragranced body lotions, shampoos, and perfumes.
Detection in tissues does not prove harm — but it does confirm that these molecules cross the skin barrier and accumulate in the body over time. A PMC study found that synthetic musks including galaxolide caused long-term inhibition of the MDR/MXR cellular defence system — the mechanism cells use to pump out toxicants — with effects persisting 48 hours after exposure, raising concern about whether these compounds may compromise the body’s natural defences against other chemical exposures. PubMed Central
For a perfumer, that finding matters. I use ambrette seed absolute as a botanical musk alternative in every Prosody London formulation precisely because it provides a genuine skin-scent quality — intimate and skin-close — without bioaccumulation concerns. The difference in olfactory performance is negligible. The difference in what accumulates in body tissue over a lifetime of daily use is not.
Phthalates: Endocrine Disruption and Reproductive Effects
Phthalates are used in mainstream fragrance as fixatives and solvents — they help fragrance molecules bind to skin and extend longevity. Most are not individually disclosed on labels, appearing instead within the collective “parfum” declaration. Our phthalate-free perfume guide explains exactly how this works and what to look for.
The peer-reviewed evidence on phthalates is more developed than for musks. Multiple studies have demonstrated that phthalates act as endocrine-disrupting chemicals at biologically relevant doses — interfering with oestrogen receptors, reducing testosterone, and affecting reproductive development. Our endocrine disruptors in perfume guide covers the full evidence base including key citations from Environmental Health Perspectives and the Lancet.
On the cancer question specifically: current evidence does not establish a direct causal link between phthalate exposure from fragrance and cancer in humans. What the evidence does show is hormone system interference — and because many hormone-sensitive cancers are linked to oestrogen exposure over time, the precautionary case for avoiding phthalates in a daily-use skin product is well-founded even without that direct causal proof.
Iso E Super: Sensitisation, Bioaccumulation and Environmental Persistence
so E Super (OTNE) deserves specific mention because it is ubiquitous in modern niche perfumery — used as an amplifier that gives fragrances a warm, radiant quality. It has been described as the MSG of perfumery and appears in an enormous proportion of contemporary niche and designer fragrance.
Under EU CLP classification, Iso E Super carries H315 (skin irritant) and H317 (skin sensitiser) designations. The European Scientific Committee on Consumer Safety has recommended it for inclusion in updated fragrance allergen labelling requirements. PubMed data confirms OTNE is detected in human breast milk, and research published via ResearchGate identifies it as a compound with limited biodegradability that persists in waterways and sewage sludge — raising cumulative exposure concerns that individual risk assessments do not fully address. For the full evidence on safety, bioaccumulation and environmental persistence, see our Iso E Super guide.
There is no current evidence that Iso E Super causes cancer at typical consumer concentrations. But it is a sensitiser, an accumulator, and environmentally persistent. I do not use it in any Prosody London formulation — not because of the cancer question but because Prosody London is built entirely from botanical ingredients, and synthetic aroma chemicals of any kind have never been part of what we make.
Cancer vs. Endocrine Disruption: An Important Distinction
These two questions are frequently conflated in fragrance health writing, and conflating them serves neither accurate science nor informed consumer choice.
Endocrine disruption refers to interference with hormone systems that regulate growth, metabolism, and reproductive function. Some fragrance ingredients — certain phthalates and synthetic musks — have shown weak oestrogenic or anti-androgenic activity in laboratory studies. A review in Nature Reviews Endocrinology examined the evidence on endocrine-disrupting chemicals and reproductive health and confirmed the biological plausibility of these mechanisms.
Endocrine disruption is not equivalent to cancer causation. Effects observed in high-dose animal studies do not translate directly to typical consumer exposure, and human epidemiology has not established cancer risk from fragrance EDC exposure at normal use levels. They are important and separate questions — and answering “does perfume cause cancer” honestly requires maintaining that distinction.
Male Fertility and Hormonal Health
The question of whether fragrance chemicals affect male fertility is better supported by the evidence than the cancer question, and worth taking seriously.
Phthalates have been associated with reduced testosterone and altered sperm development in multiple experimental studies. Synthetic musks have exhibited weak endocrine activity in vitro. Neither finding constitutes proof of harm at typical consumer fragrance exposure — but for a product applied to skin daily over many years, the precautionary case for avoiding these compounds is reasonable and scientifically grounded.
Benzene Derivatives and UV Filters
Perfumes sometimes contain benzene-derived chemicals and UV filters such as benzophenone-3 (oxybenzone). Benzene itself is a well-established human carcinogen at high occupational doses — but the benzene derivatives used in cosmetic fragrance formulations are structurally different and regulated under EU and UK cosmetics law.
Some UV filters including oxybenzone have been scrutinised for endocrine activity and skin sensitivity. Evidence directly linking these to cancer through everyday fragrance exposure is insufficient at current consumer concentrations. Asking whether perfume causes cancer on the basis of benzene derivatives in fragrance oversimplifies complex chemical behaviour and the regulatory controls that govern consumer product safety.
What the Regulatory Frameworks Say
Regulatory bodies including the EU Cosmetics Regulation and the Scientific Committee on Consumer Safety continuously review fragrance ingredients for safety. Many compounds with stronger evidence of harm have been restricted or banned — certain phthalates and nitro musks among them — not because they were proven human carcinogens at consumer doses, but because precautionary regulation prioritises safety before harm is fully established.
This is the appropriate regulatory posture. It also means that mainstream fragrance use, within current guidelines, remains within accepted safety margins for most people most of the time.
Allergies, Sensitivities, and Non-Cancer Effects
Fragrance users commonly experience skin irritation, respiratory sensitivity, headaches, and olfactory fatigue from synthetic fragrance ingredients. These are not cancer — but they are worth taking seriously in their own right. If you experience headaches or skin reactions from a fragrance, that is useful information about your personal sensitivity regardless of any broader cancer question. Our guide to perfume-induced headaches covers the most common triggers and how to identify them.
Why the Question Persists
The question “does perfume cause cancer” persists because it reflects legitimate broader concerns — about chemical exposures, hormone health, long-term low-level toxicity, and environmental contamination. Those concerns are reasonable. Many fragrance ingredients do reach the environment and accumulate in the body at trace levels. But exposure is not the same as harm, and association is not proof of causation.
At this time, no conclusive human data support the claim that normal perfume use causes cancer. What the science does show is that certain synthetic fragrance ingredients persist in the body, interact with hormone systems, and raise precautionary questions that justify both ongoing research and the choice to avoid them.
At Prosody London: A Structural Solution
I have never used synthetic musks, phthalates, Iso E Super, or any petrochemical derivatives in any Prosody London formulation. This is not a marketing position — it is what it means to work exclusively with botanical ingredients.
Every fragrance is composed from essential oils, plant absolutes, CO2 extracts, and natural resins in certified organic grain alcohol. The botanical musk character comes from ambrette seed. The longevity comes from resinous botanical fixatives — agarwood, benzoin, labdanum — that anchor the formula through molecular weight and genuine skin affinity rather than synthetic persistence.
If the questions in this article brought you here, natural perfumery is a genuine alternative — not a compromise. For the full picture of how we formulate, see our organic perfume guide and our natural perfume vs synthetic guide.
Discover Perfume Without Synthetic Chemicals
Our fragrances contain no synthetic musks, phthalates, Iso E Super, or petrochemical derivatives of any kind:
Oud Octavo — Deep resinous oud with cedarwood and smoky amber. Rich, long-lasting, entirely botanical.
Rose Rondeaux — Full-bodied organic rose with soft botanical musks and a warm patchouli dry-down.
Jacinth Jonquil — Luminous spring floral built around jonquil absolute with green and powdery depth.
Lantern Reed — A green, earthy botanical with vetiver, oakmoss, and warm woody depth. Grounding and quietly distinctive.
Santal Foy — A creamy, milky sandalwood with soft lactonic warmth and a smooth, meditative dry-down.
Ocean Commotion — Fresh aquatic cologne with citrus and sea salt, clean and skin-close.
A Capella Ray — Warm woody unisex cologne with bergamot and a smooth amber base.
Bebop Allure — Fruity floral with Cox apple, Bulgarian rose, and a botanical vetiver and myrrh base.
Not sure where to start? Our natural perfume sample set lets you try any six fragrances as 2ml samples — enough to wear each one through a full day before you decide.
FAQ
Q: Does perfume cause cancer?
A: No conclusive human evidence establishes that normal perfume use causes cancer. What peer-reviewed research does show is that certain synthetic fragrance ingredients — phthalates, synthetic musks — persist in body tissue, interact with hormone systems, and raise precautionary questions that justify ongoing research. The cancer question and the endocrine disruption question are separate and should not be conflated.
Q: Are synthetic musks in perfume dangerous?
A: Synthetic musks including galaxolide and tonalide have been detected in human breast milk and fatty tissue across multiple peer-reviewed studies, confirming they cross the skin barrier and bioaccumulate. Research has also found they can inhibit cellular defence mechanisms. There is no current proof of cancer causation at consumer fragrance doses, but the bioaccumulation finding alone is sufficient reason for precaution in a daily-use product.
Q: Do phthalates in perfume cause cancer?
A: Current evidence does not establish a direct causal link between phthalate exposure from fragrance and cancer in humans. What the evidence does show is endocrine disruption — interference with oestrogen and androgen receptors, effects on reproductive development, and reduced testosterone in experimental models. Given the relationship between long-term oestrogen exposure and hormone-sensitive cancers, the precautionary case for avoiding phthalates in a daily skin product is scientifically grounded. See our phthalate-free perfume guide for what to check on a label.
Q: What is Iso E Super and is it safe?
A: Iso E Super (OTNE) is a widely used synthetic fragrance amplifier that gives perfumes a warm, radiant, skin-scent quality. Under EU CLP classification it carries skin irritant and skin sensitiser designations. It has been detected in human breast milk samples in peer-reviewed studies and is scheduled for mandatory label disclosure under updated EU fragrance allergen regulations. There is no current evidence it causes cancer at consumer concentrations. See our full guide to Iso E Super for the complete picture.
Q: What is the difference between cancer risk and endocrine disruption?
A: Endocrine disruption refers to interference with hormone systems — mimicking, blocking, or altering hormone production. Some fragrance ingredients show this activity in laboratory studies. Cancer causation is a separate and higher evidentiary bar — requiring demonstrated mechanisms leading to malignant cell changes in humans. The two are sometimes related (hormone-sensitive cancers) but are not the same question, and conflating them in either direction misrepresents the evidence.
Q: Is natural perfume safer than synthetic?
A: Natural perfume formulated without synthetic musks, phthalates, and synthetic fixatives eliminates the specific compound classes most associated with bioaccumulation and endocrine activity in fragrance. It does not eliminate all possible sensitivities — some natural ingredients are themselves allergens for a small proportion of people. But the overall exposure profile is significantly cleaner for daily use. See our natural perfume vs synthetic guide for the full comparison.
Q: Does Prosody London perfume contain synthetic musks or phthalates?
A: No — and not as a label claim but as a structural property of our formulation. Every Prosody London fragrance is 100% botanical, built on certified organic grain alcohol with no synthetic aromatic molecules of any kind. No synthetic musks, no phthalates, no Iso E Super, no petrochemical derivatives. The musk character in our formulas comes from ambrette seed absolute. Longevity comes from natural resinous fixatives. See our organic perfume guide for the full formulation explanation.
