What it smells like
Sharp, clean and faintly bitter — the pith as much as the juice. Grapefruit is the citrus oil that reads as “fresh” rather than “sweet”, which is why it ends up in cleaning blends more often than in perfumes.
Three things to actually do with it
1. A morning diffuser blend
Three drops on its own, or two with one of peppermint. It is the one citrus that does not make a room smell like a dessert.
2. A kitchen surface spray
Eight drops in 250 ml of water with a small squeeze of unscented washing-up liquid to hold it in suspension. Shake before each use — and it cleans; it does not disinfect, and nothing here says it does.
3. In food, within the limit
The European label permits food use at one drop per day. Into fat or sugar first — a toothpick through icing or cream, never a drop into a glass of water where the first mouthful gets all of it.
What it blends with
The other citrus oils, peppermint, rosemary, and frankincense underneath to give it somewhere to land.
Getting the amount right
Photosensitising. Twelve hours out of direct sun and off sunbeds after it goes on skin — which makes it an evening oil rather than a morning one, however much it smells like morning. Diffusing is unaffected.
Food use is permitted at one drop per day. On skin, 1 % on the body. Do not store it in a plastic bottle; citrus oils attack some plastics. Full safety notes.
Questions people ask
Is it the same as grapefruit seed extract?
No — an entirely different product, not an essential oil, and not sold as one. They are confused constantly online.
Why does my spray go cloudy?
Oil and water separate. That is what the dispersant is for, and you still shake it.
How long does it keep?
A year or two after opening, like all cold-pressed citrus. Oxidised citrus is more irritating on skin than fresh, so an old bottle is a reason to replace it rather than to use it up on your arms.