Why Do My Underarms Suddenly Stink After Switching to a Natural Deodorant?

 

So you've ditched aluminium.
You switched to a deodorant only, natural or otherwise.
And suddenly… your underarms smell worse than ever.

 

If this is you, I promise you’re not broken or a toxic wasteland!
What you’re experiencing is a very real biological recalibration of your underarm microbiome and it is temporary.

 

Let’s break down exactly what’s happening under your arms and why it smells so brutal at first.

 

First: Sweat Itself Does NOT Smell

 

This part surprises most people.

Your sweat is naturally odourless when it leaves your body.

You actually produce two different types of sweat in the underarms:

 

1. Eccrine sweat

 

• Watery

• Mostly salt + water

• Triggered by heat and exercise

• Odourless

 

2. Apocrine sweat

 

• Thicker

• Rich in proteins, lipids, steroids

• Triggered by stress, hormones, puberty

• Also odourless when secreted

 

So if sweat doesn’t smell…

Where does body odour come from?

 

 

The Real Culprit: Axillary Bacteria

 

 

Your underarms are one of the most biologically active microbiome zones on your body. Warm, moist, dark, low airflow. Bacteria paradise.

 

Two bacterial groups are the main drivers of body odour:

 

Corynebacterium species

 

• The biggest offender

• Belongs to the Actinobacteria family

• So yes, people often use Corynebacterium and Actinobacteria interchangeably

• Produces the most intense odour molecules

 

Staphylococcus species

 

• Especially Staphylococcus hominis

• Contributes to sharp, acidic, sulphur-type smells

 

 

How Bacteria Turn Sweat Into Smell

 

 

These bacteria feed on your apocrine sweat and break it down into volatile smelly molecules, including:

 

• Isovaleric acid – cheesy, sweaty feet type smell

• Thioalcohols (3-methyl-3-sulfanylhexan-1-ol) – classic BO “onion” smell

• Short-chain fatty acids – sour, rancid notes

• Androstenones – musky, animalic odour (interestingly only about 50% of the population can smell these)

 

 

More apocrine sweat + more Corynebacterium + more substrate to ferment = stronger smell.

 

 

The Antiperspirant Paradox (Why It Gets Worse When You Stop)

 

 

Antiperspirants work by using aluminium salts to physically block sweat ducts. That means:

 

• Less moisture

• Less apocrine secretion

• Less immediate smell

 

But here’s the hidden issue:

 

Antiperspirants selectively favour odour-causing bacteria

 

 

Multiple studies show that:

 

• Aluminium shifts the underarm microbiome

• It increases the dominance of Corynebacterium and Actinobacteria

• While actually reducing bacterial diversity overall

 

So over time, antiperspirants create an underarm ecosystem that is:

 

• Highly efficient at producing odour

• Highly specialised for breaking down sweat into smell

 

You just don’t notice it because aluminium is blocking the sweat supply.

 

 

What Happens When You Suddenly Stop Antiperspirant?

 

 

Three things happen at once:

 

1. Your sweat ducts reopen

 

You start producing normal amounts of apocrine sweat again.

2. Your odour bacteria are still dominant

 

Your underarms are still rich in Corynebacterium and Staphylococcus hominis.

 

3. The bacteria suddenly have fuel again

 

They rapidly metabolise that sweat into strong odour molecules.

 

This is why people feel like:
“I switched to natural deodorant and now I stink MORE.”

 

You’re not producing more sweat than before.

You’re just unmasking a microbiome that was built under aluminium suppression.

 

 

How Long Does the “Detox” Phase Last?

 

On average:

 

• 7 to 14 days for mild cases

• Up to 3 to 4 weeks for long-term antiperspirant users

• Hormonal states (postpartum, pregnancy, perimenopause) can prolong this window

 

This isn’t a toxin purge. It’s simply microbiome re-balancing.

 

 

Why Some Natural Deodorants Fail During This Phase

 

Many natural deodorants only rely on:

 

• Baking soda

• Essential oils

• Fragrance masking

 

These may:

 

• Smell pleasant at first

• But do nothing to interrupt bacterial metabolism

• Or worse, irritate the skin and increase inflammation and sweat

 

The result is:

More irritation
More moisture
More bacterial feeding
More smell

 

How L’ORIENT Approaches Odour Control Differently

 

Instead of blocking sweat or killing everything on the skin, ÉCLAIR works by modulating microbial behaviour and sweat chemistry itself.

 

Here’s how each of your four key actives actually works:

 

1. Triethyl Citrate: Starving Odour at the Source

 

Triethyl citrate works by:

 

• Lowering skin pH into a range unfavourable for Corynebacterium

• Blocking bacterial enzymes that break sweat into smelly acids

 

It doesn’t kill bacteria.

It stops them converting sweat into odour.

 

This creates:

 

• Odour control without microbiome destruction

• Better long-term balance

 

2. Saccharomyces Ferment: Enzymatic Odour Digestion

 

Your Saccharomyces ferment uses fermentation enzymes to:

 

• Bioconvert existing malodorous compounds

• Neutralise odours from sweat, smoke, food, waste and environmental sources

• Function across a wide pH range

 

This makes it especially effective during the transition phase, when odour load is highest.

 

3. Debiome Noni™: Microbiome Re-Education

 

This is one of your most advanced assets.

 

Debiome Noni works through quorum sensing inhibition, meaning it:

 

• Disrupts bacterial communication

• Prevents biofilm formation by Corynebacterium and Staphylococcus

• Reduces bacterial coordination without killing them

• Rebalances the microbiome instead of sterilising it

 

Key in-vivo data:

 

• Up to 30 percent reduction in armpit odour intensity at 1 percent use

• Over 39 percent reduction in volatile odour compounds within 3 days

• Does not suppress natural perspiration
  

 

This is what allows your deodorant to work long-term, not just mask smell for a few hours.

 

4. Sage Oil + Sodium Caproyl/Lauroyl Lactylate: Selective Antibacterial Precision

 

• Selectively targets Corynebacterium xerosis and Corynebacterium tuberculostearicum

• Also acts against Staphylococcus hominis

• Works best at pH below 5

• Demonstrated 24-hour odour reduction in clinical sniff testing

• Superior to ethylhexylglycerin for sustained odour control
  

 

This gives ÉCLAIR precision odour suppression without carpet-bombing the skin barrier.

 

 

The Real Truth About the “Natural Deodorant Smell Phase”

 

 

What most people interpret as:

“This deodorant does not work”

 

Is actually:

“My microbiome is recalibrating after years of aluminium suppression.”

 

This phase will pass faster when:

 

• The pH is controlled

• Bacterial metabolism is interrupted

• Biofilms are disrupted

• And enzymes neutralise existing odour compounds

 

That’s exactly the multi-layered system ÉCLAIR uses.

 

 

What You Can Do to Get Through the Adjustment Phase

 

 

• Stick with it for at least 2 to 3 weeks

• Apply on clean, fully dry underarms

• Reapply during the day if needed in the first fortnight

• Avoid layering fragrance over active odour compounds

• Avoid harsh scrubs or baking soda during this phase

 

 

The Take-Home Message

 

 

Your body odour didn’t suddenly get worse.

Your underarms are simply learning how to sweat naturally again after years of artificial suppression.

 

And just like your gut microbiome needs time to rebalance after antibiotics,
your underarm microbiome needs time to re-establish healthy behaviour too.

 

REFERENCES

https://pmc.ncbi.nlm.nih.gov/articles/PMC12609316/