How to Get Rid of Armpit Odor (What Actually Works)

Lab notes, Tuesday, 3:40 p.m. Hypothesis: my lab assistant's deodorant has stopped working. Observation: he smells fine at 9 a.m. and like a wet gym bag by mid-afternoon. He showers daily. He wears the same polyester work shirt three days a week. He puts deodorant on while still dripping from the shower. Conclusion: the deodorant is innocent. The habits are guilty.

Here's the short answer on how to get rid of armpit odor. The smell doesn't come from sweat itself. It comes from bacteria on your skin breaking down sweat into smelly compounds. So you win by doing three things: wash those bacteria off properly, keep the area dry, and put deodorant (or antiperspirant) on clean, dry skin. Then fix the things that feed the smell later in the day, like synthetic shirts, unwashed laundry and hair that holds onto sweat. Most cases improve within a week or two of better habits.

Why do my armpits smell?

You have two main kinds of sweat glands. Eccrine glands cover most of your body and put out watery sweat to cool you down. That sweat has almost no smell. Apocrine glands sit mostly in your armpits and groin, and they switch on at puberty. Their sweat is thicker and carries fats and proteins.

Bacteria living on your skin love that apocrine sweat. They feed on it and leave behind sulfur-heavy and acidic compounds. That's the smell. Warm, dark, damp, hairy armpits are close to ideal conditions for those bacteria, which is why your armpits smell and your forearms don't.

One more variable: stress sweat. Nerves trigger the apocrine glands too. That's why a tense meeting can produce a stronger smell than a jog, even if you sweat less.

How to get rid of armpit odor: the daily protocol

This is the routine I'd hand any patient in my lab. It's dull. It works.

1. Wash with soap, not just water. Water runs off. Soap lifts the oils and bacteria. Lather each armpit and scrub for 20 to 30 seconds. Most people give their armpits a two-second pass.
2. Dry completely. Pat dry with a clean towel, then give it another minute. Deodorant on wet skin slides around and does less.
3. Apply to clean skin. Deodorant on top of yesterday's sweat is like spraying air freshener in a room you never clean.
4. Put on a clean shirt. More on this below. It matters more than people expect.
5. Reset midday if you need to. On hot or long days, wipe your armpits with a damp cloth or a cleansing wipe, dry them, and reapply.

If regular soap isn't enough, some dermatologists suggest a wash with benzoyl peroxide (the stuff in acne washes) for stubborn odor. It can bleach towels and shirts, so rinse well. Ask a dermatologist before you go that route if your skin is sensitive.

Deodorant vs antiperspirant

These get mixed up constantly, so here's the one-line version. Deodorant targets the smell. Antiperspirant reduces how much you sweat by temporarily blocking sweat ducts. Plenty of products do both.

If wet shirts bother you, antiperspirant is the tool. If the smell is your complaint and you don't mind some sweat, deodorant is enough. There's a full comparison in aluminum-free deodorant vs antiperspirant, including why antiperspirant works best when you put it on at night.

Why does my deodorant stop working?

This is the most common question I get, and my lab assistant is a perfect case study. Your body doesn't build a tolerance to deodorant the way it might to a medicine. When it "stops working," something else changed. Check this list:

If you've just moved from antiperspirant to deodorant, the first few weeks can feel like a step backward. That's the part where most people give up. Switching to natural deodorant walks you through what to expect.

Trim or shave your armpit hair

Hair gives sweat more surface to cling to and gives bacteria more places to live. It also makes soap and deodorant harder to get to the skin. You don't need to shave bare. Trimming to a short length with clippers makes a noticeable difference for a lot of men, and it's easier on the skin than a razor. If you do shave, use a fresh blade and give the skin a few hours before applying anything that stings.

Your shirts might be the real culprit

Here's an observation from my lab that surprises people: a shirt can smell bad on its own, before you've sweated in it. Synthetic fabrics like polyester tend to hold odor more than cotton, linen or wool, even after washing. Gym shirts are the worst offenders.

• Wear a shirt once, then wash it. Twice is how my lab assistant got into trouble.
• Turn shirts inside out before washing so the armpit area gets the most contact with water and detergent.
• Don't overload the washer. Clothes need room to move to get clean.
• For a shirt that still smells after a wash, soak it in a sink of water with a cup of white vinegar for an hour, then wash it again.
• Dry clothes fully. A damp shirt left in the machine overnight grows its own smell.

If a favorite shirt still smells fresh out of the dryer, it may be time to let it go. Some fabrics just keep the odor.

Does diet affect armpit smell?

A little, and I'll keep this honest. Strong foods like garlic, onions and some spices can change how your sweat smells for a day or so, and so can heavy drinking. Some people notice a difference when they cut back. But diet is a small lever compared to washing, drying and clean clothes. I wouldn't overhaul your meals before you've fixed your shower routine.

When to see a doctor

Most armpit odor is ordinary biology. But a few signs mean it's time to book an appointment:

• A sudden change in how you smell, especially a sweet, fruity or very unusual odor.
• Sweat that soaks through shirts even when you're cool and calm. That can be hyperhidrosis, which is common and treatable.
• A rash, lumps, pain or swelling in the armpit.
• Night sweats or sweating along with weight loss or fever.

A doctor or dermatologist can rule out medical causes and offer prescription options if over-the-counter products aren't cutting it.

What I keep on the shelf

By day I'm a scientist. By night, well, I need a deodorant that can keep up with a werewolf. These are the ones I reach for, all in our natural deodorant collection at $13.99 each.

• Dr. Wolf Deodorant. My own. It carries the character behind my beard oil, so if you already wear my blend, your armpits can match your beard.
• The Crusader Deodorant. Ancient Citrus Musk, Lavender Soaked Sandalwood and Eucalyptus Spice. A brighter, cleaner pick if you want something that reads fresh.
• The Marksman Deodorant. Fresh Sandalwood, Soft Mosses and Mystical Amber. Woodsy and quiet, good for an office.

Remember the order, though. Knowing how to get rid of armpit odor is mostly about the routine, and a scented deodorant still works best on clean, dry skin. No product can beat a two-second wash and a twice-worn polyester shirt.

One lab note on those samples: our beard oils contain sweet almond and argan oils, which come from tree nuts. If you have a nut allergy, check with your doctor first, and patch test anything new on your jaw.

FAQ

One last thing

Final lab notes, two weeks later. My assistant now scrubs for a full 30 seconds, waits until he's dry, and retired the polyester shirt to the rag bin. Same deodorant he always used. At 3:40 p.m. he smells like nothing at all, which in a lab is the highest compliment. Hypothesis confirmed.

Your beard, your story.

— Dr. Wolf

Keep reading in the Wizard's Library

• Aluminum-free deodorant vs antiperspirant
• Switching to natural deodorant
• Why does my beard smell?