Cinnamon leaf oil can be used as an additive in soaps and a flavoring to seasonings. When used in aromatherapy – diffused, applied topically (I recommend diluting with a mild essential oil or mixing in your favorite cream, lotion, or shampoo), or added to your bath water – it can have health-promoting effects. Here are some ways to use cinnamon leaf oil for your health and around your home. Use it as a disinfectant. With its strong germicidal properties, cinnamon leaf oil works as a non-toxic natural disinfectant..