DIY Deodorant: The 4-Ingredient Recipe to De-Stink NaturallyDIY: Deodorant What You’ll Need: 1/2 cup coconut oil 1/4 cup cornstarch (or arrowroot powder for sensitive skin) 1/4 cup baking soda 1/8 -1/4 teaspoon essential oil 1. If the coconut oil is in a solid state, put some in a microwave-safe container and pop it in the microwave for 10-second intervals (until it melts fully). 2. Mix in essential oil. 3. Add cornstarch and baking soda and mix until smooth.