Just use baking soda.
Wet a finger, dip it in baking soda and put that on an armpit when you come out of the shower and the armpit is still slightly wet. That's it.
Safe and practically free. Work...
This is what I do as well. Our bodies need to sweat. But odors can be an issue. Baking soda eliminates the odor. You don’t even have to use it every day if your diet is clean enough. I find applying baking every 2-3 days is adequate