there is one technically "nAtUrAL" antiperspirant that does work, alum (any of several naturally occurring aluminum salt minerals)

problem is they don't work as well as synthetic aluminum chlorohydrates (the most common active ingredient in commercial antiperspirants), mainly cuz they're not terribly soluble in water so it's hard to get a good amount of it on your pits by just wetting the alum rock and rubbing it on (most common application method)

as someone who hates scented anything as well as plastic packaging and increasing antiperspirant prices in the US (my two go-to brands doubled in price in the last 4 years), i've been nerding around with both alum rocks and the only consumer available aluminum chlorohydrate i could find

problem is when i run out i don't usually have time to mix up more and usually just sigh and buy some overpriced Ban Unscented Roll-On

also remember kids, antiperspirant is NOT the same as deodorant, which ought to be called Pit Perfume because it usually doesn't stop sweat or inhibit the growth of B.O.-causing skin bacteria.