A deodorant, not an antiperspirant — and why the difference matters

There's a word on the front of most underarm products that almost nobody stops to read: antiperspirant. It sounds like a synonym for deodorant. It isn't. It describes a completely different intention — and once you see the difference, it's hard to unsee.

A deodorant deals with smell. An antiperspirant deals with sweat itself. One manages an odor; the other shuts down a function your body is running on purpose. We make the first kind, deliberately, and I want to explain why.

What an antiperspirant actually does

Sweat, on its own, is almost odorless. It's mostly water and salt. The smell we associate with it comes later, when certain bacteria that live on skin break that sweat down and produce the compounds we read as body odor. So there are two different problems hiding under one product category: the sweat, and the smell.

An antiperspirant goes after the sweat. It uses aluminium salts that dissolve on the skin and form a temporary gel plug in the opening of the sweat gland, reducing how much sweat reaches the surface. It works. That's not in dispute. But the mechanism is worth saying plainly: it's a product whose job is to partially block a gland from doing the thing it evolved to do.

Sweating isn't a flaw. It's how the body manages its own temperature. I didn't want to make a product whose central promise was to stop it. That's a preference, not a health verdict — but it's the preference the whole product is built around.

Why ours is a deodorant

Aluminium is one of the fourteen ingredients we leave out of everything, under our 0% Standard. So an antiperspirant was never on the table for us — the active ingredient that makes one work is one we'd already ruled out.

That left the more interesting problem: the smell. If you're not going to block sweat, you have to actually deal with odor honestly, at the source.

Ours uses magnesium chloride — specifically Zechstein magnesium, drawn from an ancient ore bed deep beneath the northern Netherlands. Rather than plugging anything, magnesium chloride slightly raises the skin's surface pH, which disrupts the growth conditions of the Corynebacterium that produce most underarm odor. Change the environment those bacteria need, and you change how much odor gets made. The body keeps doing its job; the smell is handled a different way.

The rest of the formula is short and named in full: a water base, a plant-derived cleanser, vitamin E, and four essential oils — bergamot, kaffir lime, rosemary, and geranium — that do the scent. Not "fragrance," which can be a single word standing in for dozens of undisclosed compounds. Four oils, listed by name. Zero aluminium, zero baking soda, zero synthetic fragrance. It's all on the label, which is rather the point of everything we make.

The honest part: the first week

Here's the thing most brands won't put in writing, so I will. If you're coming off an aluminium antiperspirant, the first week can feel like a step backwards.

Your sweat glands have been partially plugged for years. When you stop, they recalibrate, and for the first few days you may notice more visible sweat than you're used to before things settle. This isn't the product failing — it's your body adjusting to not being blocked. Give it about a week. By then most people reach a steady state where odor is handled all day and the early bump in wetness has passed.

I'd rather tell you that upfront than have you try it for two days, get surprised, and conclude it doesn't work. It's a deodorant. It handles smell from day one. The adjustment is real, it's temporary, and it's worth knowing before you start.

How to use it

It's simple, and doing it right matters more than with a plugging antiperspirant. Shake it, apply one to three sprays to clean, dry underarms, and — this is the step people skip — let it air-dry fully before you dress. Re-apply after a shower or a long workout. That's the whole routine.

So which do you actually want?

This isn't an argument that antiperspirants are dangerous. They're well understood and they do what they claim. It's an argument that they're solving a different problem than most people think they're buying — and that the two problems, sweat and smell, deserve to be told apart.

If what you want is to stop sweating, a deodorant is the wrong tool and I'd rather you knew that than be disappointed. If what you want is to handle odor with something short, aluminium-free, and fully readable on the label — that's exactly what this is. A deodorant, not an antiperspirant. The difference is the whole idea.

— Mike