Grapefruit, But I adore Grapefruit essential oil, and use it regularly in the diffuser. When I first began Learning about aromatherapy in the '90s, I expected grapefruit essential to smell rather harsh and bitter. I was glad to be so wrong when I enjoyed my first whiff. Instead, Grapefruit oil has a pleasantly sweet. Tangy/tart aroma that blends well with a number of other essential oils. For a lovely aromatic combination, try blending it with frankincense oil. I also love it blending with conifers like fir needle oil.
Grapefruit Oil is a wonderfully energizing oil that isn't too strong or overpowering. I love diffusing it in the mornings or at times of the day when I need a bit of a boost. Grapefruit Oil is also great to diffuse with other energizing oils like rosemary because it lightens up and sweetens the blend.