Homemade natural deodorants use ingredients like coconut oil (antibacterial), arrowroot/cornstarch (moisture absorption), baking soda (odor neutralization), shea butter (moisturizing), and essential oils (scent/antibacterial boost) to control odor and wetness without harsh chemicals, offering benefits like skin nourishment, odor elimination, and natural dryness while avoiding aluminum, promoting healthier underarm skin.