Search “how to get rid of underarm odor naturally” and you’ll find a hundred recipes: lemon, baking soda, apple cider vinegar, coconut oil, alum stones. Each one comes with a confident promise, but very few come with a study. So we went looking for the research behind each one: which were really tested on people, what happened, and which are better left in the kitchen.
Why the smell keeps coming back
Fresh sweat barely smells. Odor appears when bacteria that live on your skin break down substances in underarm sweat into smelly compounds. That’s why you can shower in the morning and notice it again by the afternoon, especially on a hot or busy day. It’s biology, not a hygiene failure.
Heat, exercise, spicy food, hormonal changes and some medicines can all make it stronger.
Start with the wash that was actually measured
In a study of 30 men, researchers scored underarm odor before and after two routines: washing with ordinary soap, and shaving first, then washing. One of them lowered the odor score more than twice as much as the other. Can you guess which?
Whichever one wins, the everyday routine is simple: a soap your skin tolerates, a careful rinse, a gentle pat dry and a clean top. If you shave, skip it on days with cuts, razor bumps or irritation.
Lemon: the famous remedy, honestly
Lemon is the remedy everyone mentions, and it’s one of the few that has actually been tried on people. In a 2020 study, adults rubbed a slice of lemon under their arms every morning for 30 days.
56 people started. Not all of them made it to day 30, and the reason why matters before you cut your first slice.
How much did the odor drop? And how many people had to stop?
Fresher Underarms
- The verdict on every remedy in this guide, and the evidence behind it
- A 10-day plan that changes one thing at a time
- A tracker you can type into and save, or print
- When to stop, and when to see a doctor
The kitchen-shelf scoreboard
Six remedies the internet loves. We looked for the research behind every one. Which do you think were really tested on people? Make your guess, then check the verdict in the book.
Every remedy gets one of three verdicts in the book:
Apple cider vinegarVerdict in the book
Acidic, cheap and all over social media. But has anyone tested it on real underarms?
See the verdict on page 6 of Fresher UnderarmsBaking sodaVerdict in the book
Often called gentle and natural. Is it gentle on underarm skin, and does it stop odor?
See the verdict on page 6 of Fresher UnderarmsCoconut oil and tea bagsVerdict in the book
Favorites of natural-living blogs. What did we find when we looked for the studies?
See the verdict on page 6 of Fresher UnderarmsAlum stoneVerdict in the book
Sold as a natural crystal deodorant. What did the research on it actually measure?
See the verdict on page 6 of Fresher UnderarmsSageVerdict in the book
It turns up in herbal deodorant recipes everywhere. Does the kitchen herb live up to the claims?
See the verdict on page 7 of Fresher UnderarmsZinc oxideVerdict in the book
It’s in diaper cream and sunscreen. Should it go under your arms?
See the verdict on page 7 of Fresher UnderarmsWhatever you try, don’t mix several remedies into a homemade formula: that only creates a new, untested one.
Popular isn’t the same as tested.
Your shirt might be the real culprit
Fabric can hold onto smell, so a fresh body in a worn top can still smell like yesterday. If your shirt smelled stronger than your skin in the two-place check, start with the shirt: wash tops after sweaty days, keep a clean spare with you, and choose loose, comfortable fabrics.
When you try a change, judge it fairly. Odor is usually stronger on a hot, busy day than on a cool, quiet one, so compare days that were alike. A quick note of the weather, what you did and what you wore makes this easy.
And change one thing at a time. If you switch soap, shirt and remedy on the same day, you’ll never know which one worked.
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See a doctor or nurse if:
- you have a painful lump with hot, swollen skin around it, a fever or chills (don’t squeeze it)
- your usual smell changes for no clear reason, or you suddenly sweat much more
- the odor carries on despite good self-care and it’s affecting your daily life
Would you know what to do?
What if your skin stings the morning after you try lemon?
Which of the six kitchen remedies were really tested on people?
How will you know, ten days from now, that your new routine is working?
Find the answers in the bookFresher Underarms$4.99This guide is general information, not medical advice or a diagnosis. For adults with ordinary underarm odor.
Safety guidance: NHS: Body odour · DermNet: Citrus and sunlight · NHS: Boils. The studies behind every verdict are listed and linked in the book.