I react badly to baking soda so was very excited to try this. It’s extremely effective, smells great (I like lavender and rosemary patchouli), doesn’t stop working after a week or so, doesn’t stain clothes—it is a wonderful product. But I am so sad to say that after several weeks I developed an irritated ring around my underarms. It’s not as severe as with baking soda, but it was uncomfortably itchy and sensitive, and it went away with discontinuing use. I am wondering if the issue is the magnesium hydroxide, which is effective and totally nontoxic but is a basic ingredient and may interact with some people’s skin ph? So this is a note to say this is awesome deodorant, but if you’re very sensitive to baking soda, it’s possible this will bother you too.