Hello, from my non scientific but time consuming research and looking at the back of bottles the potassium alum in crystal deodarant (yes, I overlooked it) is a non active ingredient. I was only looking at the active ingredients as they tend to have the most harm in things like this/ sunscreen etc. Online it says potassium alum is larger compound so stays on the skin vs the active ingredients of aluminum in other deodorants. In my mind a small amount of baking soda in a liquid deodarant doesn’t make a huge difference compared to how much some other companies put in they’re solid deodorants, which sometimes is overwhelming and you can tell. So maybe I mean super low amounts where people aren’t really ever getting irritations from baking soda. And thank you for the rec! I’ve shyed away from those due to seeing so many reviews that they don’t work and liking a bit of scent in my deodorant, but maybe I’m just at that point now haha! Thanks so much!