Most commercial deodorants are also anti-perspirants, which spells out a double-whammy of toxicity. Sweat is one of the body's natural detoxification mechanisms, and anti-perspirants don't allow that system to flow. What's worse is that the majority of commercial antiperspirants contain aluminum, a metal that has been linked to nervous system and brain disorders, among other complications. Thankfully, we don't have to trade being healthy for smelling good - and do-it-yourself deodorant could not be easier.
Option #1: Use essential oils in a roller ball, either neat or diluted with coconut oil, depending on the oil.* I personally love Living Libations' version of essential oil blend deodorants - their Poetic Pits come in a variety of scents. (I have the lavender and rose varieties).
Option #2: Mix 1/2 cup coconut oil with 1/2 cup baking soda and add 50 drops of your favorite essential oil. I like to use lavender or lemongrass, but use the scents that appeal to you most. Store the mixture in a shallow glass jar with a wide mouth. (Note: I have seen people use empty deodorant containers, which seems like a great idea, but high-quality oils such as DoTerra may break down the plastic, and you certainly do not want to be rubbing that into your pits!)
*Some oils require dilution - please consult the book (or app) Modern Essentials, or other essential oil guide