Overview Lemon grass oil is most commonly used as an aromatherapy oil to kill bacteria, relief muscle pain and reduce body aches. It can also be consumed in tea to aid with digestive issues. Common Uses The most common uses of Lemon Grass Oil are for massages, to ward of insects, for an aromatic scent when used in a diffuser and in cosmetics to fragrance soaps and lotions. In cooking, lemon grass oil is used to flavour soups and stews as many people don't like the stocky consistency of fresh lemon grass. Recommended Storage The ideal storage of essential oils is to keep it refrigerated, as the fridge keeps the components that make up the oils at their optimal levels. If you don't have space in the fridge, you can keep it in a cool, dark place. Essential oils have a shelf life of one to five years. You should however replace essential oils after three years to gain the most benefits out of the essential oils