It's basically baking soda, arrowroot powder (or cornstartch) & coconut oil.
There's the recipe & instructions - and it works better on me than ANY commercial deodorant ever has. The only downside is that I have to store it in the fridge most of the year because coconut oil turns liquid at 76 degrees,and we don't keep our house that cool in the warmer months (i.e. March - October).