You raised your arm and never looked.

Someone wrote to us this week. Here is the question exactly as it came in, because it is a good one:

“Why buy yours when I can grab a $7 one at the store and still smell fine?”

He is right about one thing. Both of them make you smell fine. If that is all you want from the product, the $7 one wins and this page is not for you.

Before you close it, though, do one thing.

Go to the closet. Pull out the white shirt you have worn the most and look at the underarm.

That stiff yellow patch has been there for years. You have washed it twenty times. It did not come out. And it is not sweat, because sweat comes out with water. What you are looking at is aluminium chlorohydrate from the antiperspirant bonding with the proteins in sweat inside the fibre, and dryer heat sealing it in permanently.

That fabric was in contact with the product for about eight hours a day, with a layer of cotton in between, and it was permanently changed.

Your skin wore it twice as long, with nothing in between, and you cannot put it through the wash.

We are not going to tell you what that means. We do not know, and anyone who tells you they know for certain is selling you something. But the question sits there, and almost nobody asks it out loud.

Where you decided to put it.

Of everywhere on your body, you picked the worst possible place to stop paying attention.

The underarm has some of the thinnest skin on you. It is warm. It is damp. It stays covered by clothing all day, which acts like a dressing and holds everything pressed against you. And half the people reading this shaved it less than two days ago, which means they applied the product to broken skin.

Thin skin, heat, moisture, occlusion, micro-cuts. That combination is exactly what a lab sets up when it wants something to absorb.

Would you put it on your eyelid? Same thin skin. So why here?

It is three inches tall and costs less than lunch. That is why you never thought about it twice.

Now multiply it. Two applications a day, three hundred and sixty-five days, forty years. That is more than twenty-nine thousand times that small object touched the same patch of skin.

Nothing else you put on has that record. Not the cologne, not the lotion, not the soap, which is down the drain in thirty seconds.

What other decision have you repeated twenty-nine thousand times without checking it once?

What the label says.

Go get the deodorant you use and turn it around. We will read it together.

Below are some of the ingredients that show up most often in drugstore deodorants and antiperspirants, next to what dermatologists and regulators have actually said about them. We are not claiming they will make you sick. We are showing you what is on the record, with a name and a date, so you can look at it yourself.

None of the six is in Neutrant.

Not because we decided they are poison. They were six formulation decisions, made one at a time, looking at exactly this list.

If you had to read the label out loud to your child before putting it on them, would you still put it on?

Now, the $7.

Because the fear underneath was never chemicals. The fear underneath is overpaying. So let us do the whole calculation, no sleight of hand.

Thirteen cents · less than one sip of coffee

Thirteen cents a day. That is the entire gap between the two products.

Put that way, the question is no longer “why would I pay more?”

What am I buying with the thirteen cents I save?

What ours has.

Potassium alum. A mineral salt that has been used for centuries for exactly this: stopping the bacteria that turn sweat into smell.

It does not block sweat. You will keep sweating, which is what your body needs to do to hold its temperature. You just will not smell.

And it carries none of the six above. No aluminium chlorohydrate, no parabens, no propylene glycol, no alcohol, no baking soda, no formaldehyde-releasing preservatives.

It dries in about 15 seconds and a pea-sized amount is enough. A tube lasts about two and a half months.

The full chemistry, unvarnished →