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Rinse it after use and let it air dry, and keep it in its dish or case between uses. Kept dry, a single crystal stays fresh and effective for a very long time.

Yes — once you have the crystal there is nothing to throw away. It comes in minimal packaging, is used with a little water, and lasts so long it rarely needs replacing.

It suits most people and is gentle, being just a mineral salt with no fragrance. As with any personal-care product, try it on a small area first and see how it feels for you.

Dampened and rubbed on clean skin, the mineral salt leaves a fine, invisible layer that helps keep you fresh through the day. There is nothing else in it — just the crystal.

A single crystal lasts a long time — a year or more for most people. Because it is a solid mineral, it does not run out quickly and needs no refills or packaging.

It is a natural mineral salt, potassium alum, that forms in clear crystals. Across Southeast Asia it has been used for generations as a simple, natural deodorant.