Some of my favorite essential oils for deodorant are cedarwood, clary sage, geranium, lemon, lavender, tea tree, jasmine absolute, lemongrass, sweet or wild orange,
rose absolute, sandalwood, ylang-ylang, and vanilla absolute.
Don't forget that certain citrus oils are photosensitizing, so be sure not to apply a citrus-based deodorant before sunbathing or when your underarms will be at risk of burning due to sun exposure.
Also, if your mixture starts melting in the summer, try adding 1 to 2 tablespoons of
kokum butter, which is the hardest butter available.
You will need to add 4 or 5 more drops of essential oils to overcome the waxy smell of the kokum butter.