Posted by FINE Team
on July 11, 2026
In short: Baking soda (sodium bicarbonate) makes many natural deodorants effective – but on sensitive skin it can trigger redness, itching or a burning sensation, because it is alkaline and disrupts the skin's natural acid mantle. If you react to it, you still don't have to go back to an antiperspirant: Senza is the FINE deodorant cream without baking soda – gentle with magnesium hydroxide, aluminium-free and still long-lasting.
Why is there baking soda in so many natural deodorants?
Sweat itself is almost odourless. The typical smell only develops when skin bacteria break sweat down. Baking soda shifts the skin's pH slightly towards alkaline – an environment in which odour-forming bacteria multiply less easily. That is exactly why baking soda is a popular, natural and highly effective active ingredient in deodorant creams: sweat still flows freely, but it does not smell.
For most people this is ideal. Some skin, however, reacts sensitively – and then this very strength becomes a problem.
Why baking soda can irritate sensitive skin
Our skin naturally has a slightly acidic protective mantle (a pH of around 4.5–5.5). With a pH of around 8–9, baking soda is distinctly alkaline. On robust skin this quickly balances out again. On sensitive skin – or with very frequent use, a freshly shaved underarm or already irritated skin – the alkaline ingredient can disrupt the acid mantle. Possible consequences:
- Redness in the underarm
- Itching or burning, especially after shaving
- a feeling of tightness or minor skin irritation
Important: this is not an allergy in the classic sense and no sign that natural deodorant “doesn't work” – it is simply an individual sensitivity to the ingredient baking soda.
The alternative: deodorant cream without baking soda
A deodorant without baking soda has to keep odour-forming bacteria in check another way. In Senza, that job is done by magnesium hydroxide – a gentler, mineral active ingredient that sensitive skin generally tolerates far better. In addition, Senza deliberately does without essential oils, which can be another possible trigger for irritation.
| Classic FINE deodorant cream | Senza – without baking soda | |
|---|---|---|
| Odour protection via | Baking soda | Magnesium hydroxide |
| Essential oils | yes (for the scent) | no – unscented |
| Aluminium | no | no |
| Ideal for | normal skin, all scent lovers | sensitive skin, baking soda intolerance |
| Effective for | up to 24 h | up to 24 h |
The result: the same reliable protection, but without the ingredient that causes the irritation. That makes Senza the right choice for sensitive skin, for the transition phase with an irritated underarm – and for anyone who wants completely unscented odour protection.
How do I know whether I don't tolerate baking soda?
A simple clue: if redness or itching appears mainly shortly after application, or gets worse after shaving, baking soda is a likely trigger. It's worth a test: switch to a deodorant cream without baking soda for two weeks. If the symptoms disappear, you have your answer. As always with persistent skin reactions: stop using the product and seek medical advice.
Frequently asked questions
Is a deodorant without baking soda less effective? No. Senza protects just as reliably with magnesium hydroxide – for up to 24 hours. Only the active ingredient is a different, gentler one.
Is “without baking soda” the same as “without aluminium”? No – these are two different things. All FINE deodorants are aluminium-free. “Without baking soda” additionally concerns the odour-fighting ingredient and is especially relevant for sensitive skin.
Who is Senza intended for? For sensitive skin, in cases of baking soda intolerance, during pregnancy and breastfeeding, when you deliberately want to avoid essential oils – and for anyone who prefers it unscented.
Can I use Senza right after shaving? Yes. Like all FINE deodorant creams, Senza is alcohol-free – it doesn't sting, even on freshly shaved skin.
You'll find more on getting started in our transition guide and in the format comparison. Start with Senza – deodorant cream without baking soda.
Last updated: 11 July 2026 · FINE is a brand of Finor GmbH, Berlin — natural cosmetics since 2016. This article is not a substitute for medical advice.
