It helps the powder dissolve better.

No, they don’t work the same.

Unfortunately there don’t seem to be any brands without it which is why the recipe calls for the powder. And bleach is harmful to swim in and something Katie and her kids avoid. https://wellnessmama.com/health/minimize-swimming-chlorine-exposure/

Me gusto esta nueva receta de desodorante con hidroxido de magnesio pero lo que mas me gusto es que estas diciendo que te ayuda al descontrol hormonal pero antes o despues
de la menopausia?

I liked this new recipe for deodorant with magnesium hydroxide but what I liked the most is that you are saying that it helps you with hormonal imbalance but sooner or later of menopause???

You can either use more arrowroot or just omit it.