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Nonenal & Body Odor
The science of age-related body odor, what's real and what's marketing.
Heightened Sense of Smell in Menopause: What Has Been Measured
Readers in perimenopause describe smelling everything. The measured evidence points somewhere unexpected: not a sharper nose but a stronger reaction to smells.
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Why Does One Armpit Smell Worse Than the Other?
About half of people carry a different bacterial community in each armpit. Whether that makes one side smell worse to anyone else has actually been tested.
Does HRT Cause Body Odor? Following the Chain
People report HRT abolishing their body odor and causing it, often in the same thread. Here is why both can be true, and where the evidence actually stops.
Glycolic Acid for Body Odor: What an Exfoliating Acid Can Do
The reasoning behind swiping glycolic acid on your underarms is a chain of three steps. Only the first one has ever been measured in people. Here is the whole record.
Can a Fungal Infection Cause Body Odor? What Is Published
A skin yeast does live in your armpit and it does make volatile compounds. Published research has never connected it to body odour. Here is the whole record.
What Does Nonenal Smell Like? Every Published Description
One body-odour paper calls it greasy and grassy. Every other published description of the molecule comes from food chemists, and theirs are more useful.
What Age Does Old Person Smell Start? What the Studies Say
The figure of 40 comes from one 22-person study and a machine, not a nose. The only experiment that asked people to judge age by smell found something else.
Hypochlorous Acid for Body Odor: What It Can and Can't Fix
Hypochlorous acid is a disinfectant, so it is aimed at the bacterial kind of body odour. Oxidised skin oil is a different molecule with no microbes in it.
The Nonenal Research Index: Every Human Study on Age-Related Body Odor
A plain-English index of the peer-reviewed research on 2-nonenal and age-related body odor — what each study found, what it didn't, and where the evidence stops.
Perimenopause Body Odor: Is It Nonenal, Sweat, or Something Else?
Perimenopause often brings two different smells at once: sharp underarm sweat and a stale, greasy skin odor. Here's how to tell them apart and what fixes each.
Can You Smell Your Own "Old Person Smell"? How to Check Without Asking Anyone
Most people can't smell their own nonenal odor. Here's why, the signs to look for, and a simple 14-day pillowcase check you can do privately.