The no-deodorant gene: ABCC11, earwax, and body odor

The nickname is catchy. The biology is better.

There is a real gene story behind the internet fact that some people seem to need deodorant less than others. The gene is ABCC11, and one common variant is linked to dry earwax and lower production of several classic underarm odor precursors.^{1, 2, 3}

That does not mean a person has no smell, no sweat, or a permanent hall pass from washing. It means their underarm chemistry may be less prone to one familiar odor pathway. The better headline is not lucky people versus unlucky people. The better headline is variation.

Bodies do not enter the bathroom with identical chemistry. Some people sweat heavily and smell faintly. Some people barely sweat and still notice odor. Some people were taught to use deodorant every day before their underarms ever had a meaningful say in the matter.

First, what is ABCC11?

ABCC11 is a human gene that codes for a transporter protein. NCBI lists the full name as ATP binding cassette subfamily C member 11, which is accurate and also the kind of phrase that makes a normal reader gently close the laptop.¹

The short version: ABCC11 helps move certain molecules in glandular tissues. It shows up in the scientific story of earwax because earwax comes in two broad types, wet and dry. It shows up in the scientific story of underarm odor because the underarm is not just a patch of skin. It is a gland-rich, microbe-rich, fabric-covered little climate zone.

The variant most often discussed is rs17822931. In popular writing, it sometimes becomes the "no-deodorant gene." That nickname is sticky, but too clean. The gene does not decide whether you own a stick, spray, roll-on, crystal, cream, or nothing. It affects whether your body produces certain secretions that skin microbes can turn into familiar underarm odor.

Earwax was the clue

The earwax connection is not folklore. In a 2006 Nature Genetics paper indexed by PubMed, researchers identified a single nucleotide polymorphism in ABCC11 as the determinant of wet versus dry earwax type.²

That finding mattered because earwax is produced by ceruminous glands, which are related to apocrine glands. The underarm has apocrine glands too. Once researchers understood that ABCC11 helped explain earwax type, the next question was obvious: could the same gene help explain underarm odor?

Yes, with nuance. A 2010 Journal of Investigative Dermatology paper found that a functional ABCC11 allele is essential in the biochemical formation of characteristic human axillary odor.³ Dry earwax and lower typical underarm odor are connected because ABCC11 is involved upstream of both.

Odor is not sweat by itself

This is the part the deodorant aisle makes unnecessarily confusing: sweat itself is not the whole smell story. Underarm odor often starts with odorless or low-odor secretions. Skin microbes can transform some of those molecules into volatile compounds human noses notice.

A 2024 Scientific Reports paper described the interplay between ABCC11 variants and axillary skin microbiome function, especially around pathways involved in sulfur-containing underarm odor compounds.⁵ That is why the story is more interesting than gene equals smell. It is closer to a recipe: ABCC11 affects some available ingredients, and the underarm environment affects what happens next.

The habit can outlive the biology

One of the strangest findings is not only that ABCC11 affects odor chemistry. It is that deodorant habits can persist even when genotype predicts lower typical underarm odor.

Rodriguez and colleagues studied ABCC11 genotype and deodorant use in a large cohort and reported that many people with the genotype associated with lower underarm odor still used deodorant regularly.⁴ That makes sense if you have ever been twelve. Most people do not start deodorant after a careful review of their apocrine secretions. They start because a parent buys it, a locker room gets weird, or the culture announces that responsible people apply a scented layer before leaving the house.

GoodSweat takes the calmer lesson: odor is real, sweat is normal, and underarm care does not have to begin with a leave-on layer. The first US foaming underarm cleanser puts the underarm step in the shower, as a cosmetic wash, before a shirt turns everything into a social situation.

Population patterns are not personal scripts

The ABCC11 variant associated with dry earwax is more common in some populations than in others. That fact appears in the literature, and it is also where bad internet writing starts to wobble.

Population frequency is not destiny. It is not an invitation to stereotype anyone's body. It does not tell you what a person smells like, how often they wash, what they eat, what climate they live in, or what their laundry situation is doing behind the scenes.

The practical takeaway is this: underarm odor varies for real biological reasons. If you barely notice underarm odor, that does not make you cleaner. If you notice it quickly, that does not make you careless. Bodies differ, so routines should be allowed to differ too.