This oil is distilled from the fresh grass and is a natural insect repellent and vermifuge. It is often used to disinfect rooms and freshen the air. At low doses, it is non-toxic but it pays to test for skin sensitivity before applying to the skin or clothing. It blends well with eucalyptus, lavender, lemon, peppermint, rosemary, and tea tree.
Consider using this or a blend based predominantly on citronella in the amulet. It can also be added to the water used to mop floors, and it can be diffused using a nebulizer or candle.