If baking soda can subdue the odor of a cat litter box, imagine what it can do under your arms. Yep. All by itself, or if you want, you can add talc or other powder to it at a ratio or half and half. Put it in a tin and keep it in the bathroom.
After you shower, pat dry your underarms and apply the powder with a dry washcloth or piece of a dishrag. The only time this is not a good plan is when you are wearing something sleeveless.
By Susan from WV
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My favorite way to use baking soda for reasons both healthy and frugal is as an underarm deodorant. I have tried various natural deodorants and all have fallen short in controlling odor.