First published 2023, updated 2026.
Quick answer: A pH balanced deodorant is formulated to suit the naturally slightly acidic pH of your underarm skin. This helps support the skin barrier and reduces the likelihood of irritation, dryness or deodorant rash — especially compared to highly alkaline formulas like those containing bi-carb soda.
Wearing a deodorant that is too acidic or too alkaline can disrupt the skin’s natural barrier, leading to itchy underarms, dryness or rashes. Understanding how pH works — and how deodorant interacts with your skin — can help you choose a formula that feels comfortable and works more effectively.
What is the pH of your skin and why it matters
The pH of your skin is a measure of how acidic or alkaline it is. The pH scale ranges from 1 to 14, with 7 being neutral, below 7 being acidic, and above 7 being alkaline.
Your skin has a natural pH level that is slightly acidic, usually between 5.5 and 6.5. This acidity plays an important role in protecting your skin from harmful microbes, environmental stress and moisture loss. It also helps maintain the integrity of your skin barrier.
The underarm area is particularly delicate, and its pH can be influenced by factors such as age, genetics, diet and lifestyle. It can also be affected by ingredients commonly found in deodorants, body wash and soap — including baking soda, synthetic fragrance and sodium lauryl sulfate.
These ingredients can be too alkaline or harsh for some skin types, disrupting the natural balance and contributing to dryness, irritation, inflammation or breakouts.
Can deodorant affect your underarm skin pH?
Yes — deodorant can influence your skin’s pH, particularly if it contains highly alkaline ingredients.
Baking soda (bi-carb), commonly used in some natural deodorants, has a high pH. While it can be effective at neutralising odour, it may also disrupt the skin barrier for some people, especially with regular use.
When the skin barrier is disrupted, the underarm area may become more prone to sensitivity, dryness or irritation. This is why many people find that switching to a gentler, more balanced formula improves comfort.
How do you know if your underarm skin barrier is irritated?
Changes in your underarm skin can be a sign that the barrier is not functioning as well as it should.
Common signs include redness, dry patches, itchiness, sensitivity or a rash. These changes don’t always happen immediately — they can build over time as the skin becomes more reactive.
If your skin feels sore or reactive, it may be worth reviewing the formulation of the deodorant you’re using and whether it aligns with your skin’s natural pH.
If you’re already dealing with irritation or a rash, read our guide on how to avoid natural deodorant rash. If your deodorant isn’t working as expected, explore common natural deodorant problems and how to fix them.
Is your deodorant pH right for your skin?
A simple way to tell is by how your underarms feel over time.
Your deodorant is likely working well with your skin if your underarms feel comfortable, balanced and free from ongoing irritation.
Your deodorant may not be suited to your skin if you notice:
- itchiness or stinging after application
- dry, flaky or rough patches
- redness or sensitivity that builds over time
- recurring underarm rash
These signs are often linked to formulas that are too alkaline or disruptive to the skin barrier. Switching to a gentler, pH balanced deodorant can help support the skin and improve comfort.
What is pH balanced deodorant?
A pH balanced deodorant is formulated to sit closer to the natural pH level of your skin. This helps support the skin barrier rather than disrupt it.
These formulas are typically free from highly alkaline ingredients like baking soda, and instead use gentler ingredients to help manage odour while maintaining skin comfort.
For many people — especially those with sensitive or reactive skin — this can make a noticeable difference in how a deodorant feels and performs over time.
Best pH balanced deodorant in Australia
If you’re looking for a gentle, pH balanced option, Biome Natural Deodorant Cream is a well-formulated choice designed for sensitive underarms.
Biome Natural Deodorant Cream
Best for: sensitive underarms, pH balance support, and everyday odour control
Why it stands out: pH balanced deodorant cream that is designed to support the skin barrier rather than disrupt it.
It avoids highly alkaline ingredients like bi-carb soda, making it a gentler option for underarms prone to irritation, dryness or deodorant rash.
Instead, it uses magnesium to help neutralise odour while supporting the skin barrier — a key factor in maintaining comfortable, balanced underarms over time.
This natural deodorant is: bi-carb free, aluminium free, alcohol free, vegan, palm oil free and made in Australia.
What customers say
“No irritation whatsoever, even after shaving. It just feels comfortable on my skin.”
“I’ve tried so many natural deodorants — this is the first one that actually works and doesn’t irritate.”
“Lasts all day and feels really gentle. I don’t get that dryness or itchiness anymore.”
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FAQ: pH balanced deodorant
Is pH balanced deodorant better for sensitive skin?
Yes. A pH balanced deodorant is designed to work with the skin’s natural acidity, which can help reduce the likelihood of irritation for sensitive underarms.
Can baking soda deodorant irritate underarms?
For some people, yes. Baking soda is highly alkaline, which can disrupt the skin barrier and lead to dryness, itching or rash over time.
What pH should deodorant be?
Ideally, a deodorant should sit close to the skin’s natural pH, which is typically between 5.5 and 6.5.
What is the best deodorant for itchy underarms?
A gentle, bi-carb free and pH balanced formula is usually the best place to start if your underarms feel itchy or sensitive.
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