The Deodorant Aisle Confusion Nobody Talks About
You're standing in the deodorant aisle. Everything's labelled "natural." "Aluminium-free." "Clinical strength." "Bicarb-free." And you're thinking: aren't these all basically the same thing?
They're not. Not even close.
Aluminium, magnesium, and bicarb all control odour, but in completely different ways. Once you understand that difference, choosing the right deodorant becomes straightforward.
First Things First: Sweat Doesn't Actually Smell
This is the biggest myth in deodorant marketing.
Fresh sweat is odourless. Seriously. The smell happens when sweat mixes with bacteria naturally living on your skin, especially in warm, moist areas like your underarms. As those bacteria break down sweat, body odour develops.
That's why natural deodorants focus on controlling odour-causing bacteria rather than trying to stop sweating altogether.
The logic is simple:
- Sweat is normal
- Sweat is healthy (it cools your body)
- Bacteria create the smell, not sweat itself
This is also why magnesium hydroxide works so well. Instead of blocking your body from sweating, magnesium creates an environment where odour-causing bacteria struggle to thrive.
You still sweat. Your body still cools itself. You just smell fresher while doing it.
How Aluminium, Magnesium, and Bicarb Actually Work
Let's break down each ingredient properly.
1. Aluminium: Stops Sweat Completely
Aluminium (such as aluminium chlorohydrate or aluminium zirconium) is used in antiperspirants. It works by temporarily blocking your sweat ducts, which reduces the amount of sweat reaching the skin.
That's why aluminium deodorants feel dry. They're literally stopping sweat from coming out.
This can be helpful if heavy sweating is your main concern. But it also means your body's natural cooling process is being interrupted. Sweat needs to go somewhere. When your sweat ducts are blocked, you're essentially fighting your body's thermoregulation system.
2. Magnesium: Neutralises Odour and Absorbs Moisture (Without Blocking Sweat)
Magnesium hydroxide works completely differently.
It doesn't block sweat ducts. Instead, it changes the pH of your skin slightly, making it harder for odour-causing bacteria to thrive. No bacteria means no smell.
You still sweat, so your body still regulates temperature. The odour is just controlled.
This is why magnesium is increasingly used in natural deodorants. It works with your body instead of trying to override it.
3. Bicarb (Baking Soda): Effective, But Not for Everyone
Bicarb (baking soda) is another common ingredient in natural deodorants. Like magnesium, it works by neutralising odour-causing bacteria.
Here's the problem: bicarb is highly alkaline, while your skin is naturally slightly acidic.
That mismatch can cause:
- Irritation
- Redness
- Itching
Especially for sensitive skin.
It doesn't happen to everyone, but it's one of the most common reasons people stop using bicarb deodorant.
The Quick Comparison
| Ingredient | How It Works | Blocks Sweat? | Best For |
|---|---|---|---|
| Aluminium | Blocks sweat ducts | Yes | Heavy sweating |
| Magnesium | Neutralises bacteria via pH balance | No | Everyday use, all skin types |
| Bicarb | Neutralises bacteria (highly alkaline) | No | Everyday use, but NOT sensitive skin |
Which One Is Actually Better?
This is where people want a simple answer.
But the truth is: it depends on your body and what you're looking for.
If your goal is staying completely dry and you don't mind aluminium under your armpits, aluminium-based antiperspirants will work (though we'd strongly advise against it for long-term health reasons).
If your goal is controlling odour while letting your body function normally, magnesium is usually the better option.
If you've used bicarb and it works for you, great. But if you've experienced irritation, that's almost certainly why.
Why Magnesium Is Becoming the Standard
More and more people are moving toward magnesium-based deodorants for one simple reason: it strikes a balance.
It controls odour effectively. It doesn't block sweat. And it's gentler on the skin than bicarb.
That's why we use magnesium in our Viva La Body Natural Solid Deodorants. Because you don't have to choose between a deodorant that works and happy skin.
The Adjustment Phase (What to Expect)
If you're switching from aluminium to natural deodorant, you might notice a short adjustment period. This isn't your body failing.
It's your body recalibrating after years of blocked sweat glands. This is completely normal.
For a couple of weeks, you might notice:
- More sweating
- Stronger odour
- Needing to reapply more often
Your body is simply recalibrating after years of blocked sweat glands. It passes. Once things settle, most people find their body balances out again, and they actually need to reapply less often because their sweat production normalises.
FAQ: Aluminium, Magnesium & Bicarb Deodorants
Does magnesium deodorant actually stop sweating?
No. Magnesium deodorant does not block sweat. It controls odour by neutralising bacteria while allowing natural perspiration. Your body will still sweat, which is healthy and necessary for temperature regulation.
Is aluminium deodorant bad for you?
Aluminium-based antiperspirants work by blocking sweat glands. Some people prefer to avoid them to allow natural sweating and because they want to avoid interrupting their body's cooling system. Individual preference varies, but the scientific consensus is that blocking sweat is unnecessary for odour control.
Why does bicarb deodorant cause irritation?
Bicarb is highly alkaline, which can disrupt the skin's natural pH and lead to irritation, especially for sensitive skin. If you've experienced redness, itching, or irritation with bicarb deodorant, this pH mismatch is almost certainly why. Your skin is naturally slightly acidic, and bicarb throws that balance off.
Is magnesium better than bicarb deodorant?
For most people, yes. Magnesium is gentler on the skin because it works closer to the skin's natural pH, making it a better option for people with sensitivity. Bicarb can irritate, especially with regular use. However, if bicarb works for you without irritation, there's no need to switch.
What's the best deodorant for sensitive skin?
Magnesium-based deodorants are often preferred for sensitive skin due to their pH balance and lower risk of irritation. Our Sensitive (Unscented) Magnesium Deodorant is formulated specifically for reactive skin. No irritants, just effective odour control.
How long does the adjustment period last?
Most people experience the adjustment period for 1-3 weeks when switching from aluminium to magnesium. During this time, your sweat glands are recalibrating after years of being blocked. After the adjustment period passes, your body usually balances out and you may find you need to reapply deodorant less often.
Do Viva La Body deodorants contain aluminium or bicarb?
No. All Viva La Body deodorants are aluminium-free and bicarb-free. They're formulated with magnesium hydroxide, which controls odour effectively without blocking sweat or irritating sensitive skin. We choose ingredients that work with your body, not against it.
Real Talk: Magnesium Wins
If we had to crown a winner, magnesium takes it. Not because it's perfect. But because it works with your body instead of against it, and it keeps odour under control without shutting down a natural process.
Plus, it suits almost all skin types. Including the ones that react to everything else.
You shouldn't have to choose between staying fresh and keeping your skin happy. At Viva La Body, our magnesium deodorants are formulated to do both.
Aluminium-free. Bicarb-free. Magnesium-powered. Plastic-free.
Make the switch. Your underarms (and your co-workers) will thank you.
