What Is Crystal Deodorant, and Is It Safer Than Antiperspirant?
60g 2pcs Natural Crystal Deodorant Alum Stick Body Odor Remover Antiperspirant Potassium Alum Stone Stick Twist Top After Shave|body odor|alum stickalum stone - AliExpress
What is an alum stone and how do you use it? – Eco Collective
Is the alum in crystal deodorants really safer than the aluminum in antiperspirants? - NOW Magazine
Potassium alum - Wikipedia
Deodorant: Is the alum stone as harmless as it claims?
Everything You Need to Know About Natural Deodorant
Best Natural Deodorant Guide | Native Deodorant | Gimme the Good Stuff