Fragrance in aftershave can carry phthalates. Studies link one of them to sperm changes, and related phthalates to lower testosterone, but no study has shown that the amount in your aftershave changes your hormones. What is clear is that men who use aftershave or cologne carry about twice as much of a fragrance phthalate in their urine, so the link between fragrance in aftershave and hormones is worth knowing about, without panic.
I am a barber, not a scientist. But men in my chair ask me about this every week, so I went through the research. This is what it says, and what it does not.
"Fragrance" on a label can mean dozens of ingredients.
Turn over almost any aftershave and you will see "fragrance" or "parfum" near the top. That one word is not one ingredient. A single scent can be a blend of many chemicals.
In the United States, brands may list the whole blend as "fragrance". The individual chemicals in it can stay a trade secret. You have no way to see them from the label.
In the EU, the rules are tighter. Brands must name certain fragrance chemicals that are known to cause skin allergies once they pass a small amount. In 2023 the EU grew that list from about two dozen to more than eighty. Products placed on the market from mid 2026 must follow the new list.
Even so, the EU list is about allergies. It does not require a brand to name every chemical in the blend.
Phthalates help a scent last longer.
Phthalates are a family of chemicals. Many are used to make plastics soft. One of them, diethyl phthalate, is used in fragrances to help the scent spread and stay on the skin.
Here is a point most articles skip. Phthalates are not all the same. The EU has banned some of them from cosmetics completely, including dibutyl phthalate and diethylhexyl phthalate, because of their effects on the male reproductive system in animal studies. Diethyl phthalate is still allowed. The EU's scientific committee reviewed it and found it safe in cosmetics at the levels used at the time.
So when someone says "phthalates lower testosterone", ask which phthalate. The answer matters.
Aftershave raises one phthalate in men's urine.
The clearest study on this was done at Harvard and published in Environmental Health Perspectives in 2005. Researchers asked 406 men which grooming products they had used in the last two days. Then they measured phthalate breakdown products in their urine.
The results were clear:
- Men who had used aftershave or cologne had about twice the level of monoethyl phthalate in their urine. That is what the body turns diethyl phthalate into.
- Each extra type of product a man used raised that level by about a third.
So the link between fragrance products and phthalate levels in men is real. Your aftershave is one of the ways this chemical gets into your body.
What the research links to hormones and sperm.
Now the harder question. Does that phthalate do anything to you?
Sperm.
The same Harvard group studied 168 men in 2003. Men with more monoethyl phthalate in their urine had more DNA damage in their sperm, as measured in a lab test. It was the only phthalate in that study with a clear link.
Testosterone.
A 2014 study of a large US health survey found that some phthalates were linked to lower testosterone. In adult men, the clearest links were with diethylhexyl phthalate and dibutyl phthalate, mainly in men aged 40 to 60. Those are the phthalates the EU already bans from cosmetics. The fragrance phthalate was not the main signal there.
Baby boys.
A 2005 study measured phthalates in pregnant women's urine. Mothers with higher levels of several phthalates, including the fragrance one, were more likely to have baby boys with small changes in genital development. That is about exposure before birth, not about grown men. It is one reason scientists keep studying this group of chemicals.
What the research does not say.
This is where many websites stop telling the truth. So here is the other side.
- These studies show links, not proof. A man with more of a chemical in his urine may differ in many other ways. The studies cannot show that the chemical caused the change.
- The studies are small. A few hundred men is a start, not a final answer.
- Phthalates leave the body fast. They break down and leave in your urine within about a day. One urine sample is a snapshot, not a lifetime dose.
- Regulators still allow diethyl phthalate. The EU's expert committee looked at it and found it safe at normal cosmetic levels.
- No study has tested your aftershave. Nobody has shown that one daily splash changes a grown man's testosterone.
So the fair summary is this. Fragrance in aftershave puts a phthalate in your body. That phthalate has been linked to sperm and hormone effects in some studies. The link is not proven, and the regulators have not banned it.
Some men read that and shrug. Others read it and think: I do not need a chemical with open questions on my neck every morning just to smell nice. Both are reasonable. The point is to know what you are choosing.
Natural fragrance is still fragrance.
Swapping to a "natural" scent does not solve the question. Plant oils are made of chemicals too.
In 2007 the New England Journal of Medicine reported three young boys who grew breast tissue while using products with lavender oil and tea tree oil. It went away after they stopped. In lab tests, both oils acted a little like the hormone oestrogen and blocked some effects of male hormones.
That was three cases, in children. It proves nothing about grown men. But it shows that "natural" and "hormone free" are not the same thing. If you want to avoid scent chemicals, the simplest choice is no fragrance at all.
Fragrance also bothers freshly shaved skin.
Hormones get the headlines. Skin allergy is the more common problem.
The EU's scientific committee estimates that 1 to 3 percent of people in Europe are allergic to at least one fragrance chemical. Fragrance is one of the most common causes of skin allergy from cosmetics.
On a fresh shave, the risk goes up. The blade has scraped the surface. Ingredients get in more easily, and most aftershaves pair fragrance with alcohol, which helps other ingredients get into the skin. In my chair, the men with the angriest necks are often the ones using the strongest smelling splash.
How to read the label.
You do not need a chemistry degree. Look for these words:
- Fragrance, parfum, aroma. A scent blend. You cannot see what is inside.
- Linalool, limonene, citronellol, geraniol, coumarin. Common fragrance allergens the EU requires brands to name.
- Essential oil names. Lavender, tea tree, citrus oils. Still fragrance.
- "Unscented". Can still contain a masking scent. "Fragrance free" is the better phrase to look for.
Diethyl phthalate is almost never listed on its own, because it hides inside the word "fragrance". So the only way to be sure it is not in your aftershave is to choose one without fragrance.
What I put on a fresh neck.
After a shave, the skin needs to be cooled, tightened and left alone. It does not need perfume.
In my shop I finish with a natural stone. It is one mineral, nothing added. Wet the stone, run it over your neck, wait about a minute and rinse with cold water. It calms the sting, tightens the surface and is antibacterial. It has no alcohol or fragrance to mess with your hormones, and nothing in it hides behind a vague word on the label.
If you like to smell good, put your cologne on your clothes or your chest later in the day. Keep it off the skin you just shaved.
Leave the scent off your neck.
You do not have to fear every bottle. You just have to know what is in it. If you want the minute after shaving to be one ingredient and nothing to wonder about, try Flint, the barber's stone for after shaving. One stone lasts up to two years of daily shaves, shipping is free, and if your neck is still red after 90 days you get a full refund and keep it.
Frequently asked questions
Does aftershave contain phthalates?
Many scented aftershaves can. Diethyl phthalate is used in fragrance blends to help the scent last, and it is usually hidden under the word "fragrance" or "parfum". A 2005 Harvard study found men who used aftershave or cologne had about twice the urine level of its breakdown product.
Can aftershave lower testosterone?
That has not been proven. Some studies link certain phthalates to lower testosterone, but the clearest links in adult men are with phthalates the EU already bans from cosmetics. No study has shown that normal aftershave use lowers a grown man's testosterone.
Is natural fragrance safer than synthetic fragrance?
Not by default. Plant oils are chemicals too, and some cause skin allergies. In lab tests, lavender and tea tree oil acted a little like hormones, and they were linked to three cases in young boys. If you want to avoid scent chemicals, choose fragrance free.
What is the difference between unscented and fragrance free?
"Fragrance free" means no scent ingredients were added. "Unscented" can mean the product simply has no smell, which sometimes involves a masking fragrance. On a fresh shave, look for fragrance free.
Is fragrance bad for skin after shaving?
It can be. Fragrance is one of the most common causes of skin allergy from cosmetics, and shaving leaves the surface scraped and open. That makes a reaction more likely. Most men do better keeping fragrance off freshly shaved skin.
Sources
- Duty SM, Ackerman RM, Calafat AM, Hauser R. Personal care product use predicts urinary concentrations of some phthalate monoesters. Environmental Health Perspectives, 2005;113(11):1530 to 1535. PMC1310914.
- Duty SM, Singh NP, Silva MJ, et al. The relationship between environmental exposures to phthalates and DNA damage in human sperm using the neutral comet assay. Environmental Health Perspectives, 2003;111(9):1164 to 1169.
- Meeker JD, Ferguson KK. Urinary phthalate metabolites are associated with decreased serum testosterone in men, women, and children from NHANES 2011 to 2012. Journal of Clinical Endocrinology and Metabolism, 2014.
- Swan SH, Main KM, Liu F, et al. Decrease in anogenital distance among male infants with prenatal phthalate exposure. Environmental Health Perspectives, 2005. PMID 16079079.
- Henley DV, Lipson N, Korach KS, Bloch CA. Prepubertal gynecomastia linked to lavender and tea tree oils. New England Journal of Medicine, 2007;356(5):479 to 485. PMID 17267908.
- European Commission, Scientific Committee on Cosmetic Products and Non-Food Products. Opinion on diethyl phthalate, 2002, reconfirmed in later review.
- European Commission, Scientific Committee on Consumer Safety. Opinion on fragrance allergens in cosmetic products, SCCS/1459/11, 2012.
- Regulation (EU) 2023/1545 amending Regulation (EC) No 1223/2009 as regards labelling of fragrance allergens in cosmetic products.
- Lachenmeier DW. Safety evaluation of topical applications of ethanol on the skin and inside the oral cavity. Journal of Occupational Medicine and Toxicology, 2008;3:26. PMID 19014531.
- US Centers for Disease Control and Prevention. Phthalates factsheet, National Biomonitoring Program.
