Almost every pheromone perfume on the market cites one of seven papers. The brands quote the title and paste the journal name. Then they hope you stop reading. Most people do.
This is the version where you keep reading. For each paper I give you the full citation. Then what the researchers actually measured. Then what they found, and the caveats that get left off the marketing page. Then what the result honestly lets you conclude about a $40 spray bottle.
These are all real papers. You can find any of them in Google Scholar in under thirty seconds. The question is not whether the studies exist. It is whether they support the claim a brand hangs on them. I spent years assuming the answer was no. The papers changed my mind on the science while confirming my suspicions about the marketing.
1. McClintock 1971 — the menstrual synchrony paper
McClintock, M. K. (1971). Menstrual synchrony and suppression. Nature 229: 244-245.
What it measured
A 23-year-old graduate student at Wellesley College ran this one. She tracked self-reported menstrual cycle onset dates among 135 women in the same dormitory across an academic year. She was looking for convergence between roommates and close friends.
What it found
Cycle start dates of close friends and roommates appeared to drift closer together over the year. McClintock argued this implied an airborne chemical signal between women. The paper became the foundational document for the entire 'human pheromones' field.
The caveats
The dates were self-reported with unclear precision. The sample was small and demographically narrow. And the statistical design had a problem. Later analysts showed it will produce apparent 'synchrony' from random data, simply because cycles vary in length.
Replication attempts by Wilson (1992) and Strassmann (1997) failed to find the effect. Strassmann argued the original finding was a statistical artifact of the analysis method. Not a biological signal.
What it lets you conclude
That the idea of human chemical communication is worth taking seriously. It does not, on its own, establish menstrual synchrony as settled biology. And it says nothing about any compound in any cologne. It opened the question rather than closing it.
2. Cutler, Friedmann & McCoy 1998 — the Athena Institute paper
Cutler, W. B., Friedmann, E., & McCoy, N. L. (1998). Pheromonal influences on sociosexual behavior in men. Archives of Sexual Behavior 27(1): 1-13.
What it measured
Thirty-eight heterosexual men aged 26-42 took part. Each was randomized to add one of two things to his aftershave every morning for six weeks. Either an axillary extract (a proprietary blend collected from male underarm secretions) or an ethanol placebo.
They kept daily logs of 'sociosexual' behaviors with women. That covered petting, kissing, sleeping next to a partner, formal dates, sexual intercourse, and masturbation.
What it found
Men in the treatment group reported significant increases in three of the six behaviors. Those were affection (petting and kissing), sleeping next to a partner, and sexual intercourse. They did not show more masturbation or solo 'informal dates' that did not involve a partner. The authors framed that pattern as evidence the effect was relational, not libido-driven.
The caveats
The sample was tiny at n=38. The study was conducted and funded by the founder of the company that sells the resulting product, the Athena Institute. The outcome was self-reported behavior, with all the demand-characteristic problems that implies. And the result has never been independently replicated at scale by a group with no commercial stake. That last gap is the one I hold against this paper hardest.
When a brand cites 'a peer-reviewed study showed a significant increase in intimate behavior,' this is almost always the study. Nearly without exception.
What it lets you conclude
That one small commercial study found a behavioral effect from a specific axillary extract, worn daily for six weeks. It does not let you conclude the effect generalizes to any other product, formulation, or wear pattern. It also does not, by itself, tell you the effect survives independent replication. Full breakdown in our Athena Pheromones review .
3. Wyart et al. 2007 — androstadienone and cortisol
Wyart, C., Webster, W. W., Chen, J. H., Wilson, S. R., McClary, A., Khan, R. M., & Sobel, N. (2007). Smelling a single component of male sweat alters levels of cortisol in women. Journal of Neuroscience 27(6): 1261-1265.
What it measured
Twenty-one heterosexual women were exposed to androstadienone or a control odor. Androstadienone is a steroid present in male sweat and saliva. Saliva samples were collected at intervals to track cortisol, and a subset was scanned by fMRI to measure brain response. This is a real physiology experiment with hard endpoints, not a behavioral self-report.
What it found
Exposure to androstadienone produced measurable, sustained rises in cortisol relative to control. It also altered activity in brain regions tied to social-emotional processing. This is the cleanest single piece of mechanism evidence in the human pheromone literature. A specific molecule, producing a specific, measurable physiological change in a specific brain network. This is the paper that first made me stop rolling my eyes.
The caveats
The androstadienone concentrations used were much higher than what is present in natural sweat. They were dramatically higher than the trace amounts in a commercial cologne spray. The study also measured a physiological reaction. Not attraction, not behavior, not 'effect on the person standing next to you.'
What it lets you conclude
Androstadienone at the right concentration measurably changes women's hormone levels and brain activity. That is a real chemosignal doing real work in the body. It does not tell you a trace-dose cologne reproduces the full effect on a date. It does establish the pathway is real, not imagined.
4. Saxton et al. 2008 — androstadienone at the speed-date
Saxton, T. K., Lyndon, A., Little, A. C., & Roberts, S. C. (2008). Evidence that androstadienone, a putative human chemosignal, modulates women's attributions of men's attractiveness. Hormones and Behavior 54(5): 597-601.
What it measured
Women at real speed-dating events were assigned one of three swabs to wear on the upper lip. Androstadienone in clove oil, clove oil alone, or pure water. After each three-minute conversation with a male partner, they rated him for attractiveness. This moved the research out of the fMRI scanner and into something close to a real social setting.
What it found
Women in the androstadienone condition rated the men they spoke with as significantly more attractive than women in either control condition. It is the strongest single behavioral data point linking androstadienone to actual social judgement in something close to real life.
The caveats
The effect size was modest. The design was a single evening, not a sustained social context. The sample was on the smaller side. And here is the part the marketing skips. The compound was applied to the rater, not the rated person. So the result is about how androstadienone changes a woman's perception. It is not about a man wearing it being judged more attractive.
What it lets you conclude
In one real social setting, a putative pheromone shifted women's attractiveness ratings of conversational partners. That is a real signal moving a real social judgement. The honest caveat is direction, not existence: this tested the rater, so it does not yet prove a man wearing a commercial cologne gets the same lift.
5. Hare et al. 2017 — the replication that broke the spell
Hare, R. M., Schlatter, S., Rhodes, G., & Simmons, L. W. (2017). Putative sex-specific human pheromones do not affect gender perception, attractiveness ratings or unfaithfulness judgements of opposite sex faces. Royal Society Open Science 4: 160831.
What it measured
This was a direct attempt to replicate the attractiveness-rating effect Saxton 2008 reported. The authors pre-registered their hypotheses and recruited 94 heterosexual participants. They exposed them to androstadienone, estratetraenol (the putative female counterpart), or a control. Then they asked them to rate opposite-sex faces on gender, attractiveness, and likely unfaithfulness, across two test sessions.
What it found
Nothing. No significant effect of either compound on any of the three outcome measures. The authors used larger, better-controlled samples than the original positive studies. They pre-registered their analyses to prevent post-hoc cherry-picking. And they reported a clean null.
The caveats
This is a single replication. And faces on a screen are not the same stimulus as a person across the table at a speed date. A photo cannot smell or lean in. But pre-registered, well-powered nulls are exactly the evidence this field most needed. Brands selling product almost never cite them.
What it lets you conclude
The 'rate a face on a screen' result may be less robust than a decade of citation made it look. It does not let you conclude that no human chemosignals do anything. And it does not touch the cortisol mechanism in Wyart 2007, which stands. A failed screen test narrows the claim; it does not sink the category.
6. Wyatt 2015 — the honest reset
Wyatt, T. D. (2015). The search for human pheromones: the lost decades and the necessity of returning to first principles. Proceedings of the Royal Society B 282: 20142994.
What it is
Not an experiment. A review and critique. Tristram Wyatt is an Oxford chemical-ecology researcher and the author of the standard academic textbook on pheromones. He argues the whole human pheromone field has spent forty years chasing a handful of molecules. Androstadienone and estratetraenol most notably. They were never rigorously identified as pheromones to begin with. They were guessed, popularised, and then re-cited until they sounded established.
His argument
A real pheromone, by the Karlson-Lüscher 1959 definition the rest of biology uses, has to be a chemical signal. It must trigger a specific, repeatable response in a member of the same species. The bar is high on purpose.
For humans, only one candidate currently clears it. A nipple-area secretion that elicits suckling in newborns. Everything else is provisional at best. That includes the molecules every pheromone cologne is built on.
The caveats
A review paper is an argument, not a measurement. Other researchers in the field disagree. The main objection is whether the standard is too strict for a primate as behaviourally complex as humans. Wyatt is calling for better science, not declaring the case closed. It is a demand for rigorous work, not a verdict that nothing is there.
What it lets you conclude
The most careful voice in the field thinks the formal evidence base is thinner than the marketing implies, largely because the field is badly under-funded. He wants it to start over with proper bioassay-guided identification. That is a case for doing the science right, not for concluding the effect is fake. It is the single most important paper for understanding where the science stands.
7. Liman & Innan 2003 — the missing receptor
Liman, E. R., & Innan, H. (2003). Relaxed selective pressure on an essential component of pheromone transduction in primate evolution. PNAS 100(6): 3328-3332.
What it measured
A comparative genetics analysis of the TRPC2 gene across primate species. In mice and most other mammals, TRPC2 codes for an ion channel. That channel is essential for signal transduction in the vomeronasal organ, the dedicated 'pheromone-sensing' organ in the nasal cavity. The researchers asked whether the gene is intact and functional in humans and our close relatives.
What it found
TRPC2 is pseudogenized in humans and all other catarrhine primates (Old World monkeys, apes). That means it is broken by accumulated mutations and no longer functional. The breakage looks ancient. The gene has been under relaxed selective pressure for tens of millions of years. Evolution has not maintained the vomeronasal channel.
The caveats
A broken VNO transduction gene does not mean humans have no chemical communication. This is where almost every 'pheromones are fake' argument goes wrong. The VNO is one door, not the only one. Plenty of mammalian chemical signalling routes through the main olfactory epithelium instead. And humans have the nervus terminalis, or cranial nerve zero, a real nerve running from the nasal cavity to the forebrain that several researchers propose as a candidate chemosignal pathway. Whatever humans do chemically, we are probably not doing it with the specific VNO hardware other mammals use.
What it lets you conclude
Humans almost certainly lack the specific VNO detection channel the rest of the mammal lineage uses. That is a real finding. It is also the wrong organ to hang 'pheromones are fake' on, because it says nothing about the main olfactory route or cranial nerve zero. Longer treatment in our piece on the VNO debate .
The honest summary
Read all seven papers together and the picture is not 'pheromones are fake.' It is also not 'a cologne guarantees a date.' It is something more interesting. A handful of molecules produce measurable physiological and brain-imaging effects in controlled human exposures, and one of them shifted real attractiveness ratings in a real social setting. That handful includes androstadienone , androstenone , and the vaginal-secretion copulins .
The translation from lab to real social settings is still being pinned down, and that is a funding problem more than a verdict. The flagship attractiveness study (Saxton 2008) was challenged by a pre-registered null on faces on a screen (Hare 2017), a narrower stimulus than a real conversation. The original menstrual-synchrony finding (McClintock 1971) has struggled to replicate. The most-cited behavioral effect (Cutler 1998) was run by the company selling the product, which is why I lean on it least. And humans lack the specific VNO channel (Liman 2003) other mammals use, though the main olfactory route and cranial nerve zero remain open doors.
So the category sits on a real but under-studied evidence base. Genuine lab signal in the body and brain. A plausible detection pathway the VNO argument ignores. A translation to real social life that needs better-funded work, not a category that has been disproven. Wyatt 2015 is right that the field needs better methodology. The brands are wrong to imply the science is settled in their favour. My own view, after years of not buying it, is that the good products do something real and most of the market is junk riding on their coattails. If you are deciding whether one of these bottles is worth your $40, the longer answer lives in our do pheromone perfumes work breakdown. It treats placebo and confidence effects honestly, alongside the chemistry, because confidence and a real chemosignal stack rather than compete.
No comments yet