"As the rosemary is the Spirit, so Lavender is the Soul, or according to an old proverb, as a Man is to a Woman. Rosemary and Lavender as messengers from the stars followed Adam and Eve from Paradise in the form of plants as a God-given token to remind this first man and woman of their starlit home. Ever since, they have followed man wherever he goes, through temptations and sickness, and God has given these two lowly plants the power to bestow on man strength, health, endurance, and resistance to disease. Their mission is to follow man until he returns to his starry home. So goes a beautiful old legend."
That comes from Jeanne Rose's Kitchen Cosmetics: Using Herbs, Fruits, and Eatables in Natural Cosmetics (1978). There is so much folklore and history that revolves around lavender and its many uses, but I think this legend is particularly lovely to imagine. And quite lofty considering that I'm just talking about deodorant. Well, here's a very simple recipe for an effective deodorizing body powder. The cornstarch absorbs moisture, the baking soda neutralizes odors, and the lavender provides some extra antiseptic action as well as a soft, old-fashioned, floral scent. Make sure your baking soda is aluminum free (most are, including Arm and Hammer).
1/4 cup cornstarch or arrowroot powder
1/4 cup baking soda
6 to 7 drops lavender essential oil
Place cornstarch and baking soda in a jar, cap, and shake to combine. Add essential oil, and shake again to fully disperse oil through the mixture. Let stand, capped, overnight before using for best results.
Of course, you may use any essential oil you like in this, or even a custom blend of several. Some other essential oils that are particularly well-suited for deodorants are bergamot, clary sage, cypress, eucalyptus, lemon, juniper, grapefruit, neroli, patchouli, pine, rosemary, rosewood, tangerine, tea tree, and thyme.