This is a high-quality pure peppermint oil, and for a lot better per-ounce price than some of the essential oils companies charge. It is pure, therapeutic grade, and smells very nice. You can search the internet for many uses, though I am using it for external purposes only. The bottle states it is for external uses only (not to be taken internally) ,, not sure why but follow directions.
You can mix a couple of drops with equal amount of a carrier oil and b behind you ears to aid in nausea. It makes an excellent insect repellant (most bugs hate the smell) but don't overdo it. It is also a great natural antibacterial. Of course, it is great in your diffuser, just a few drops in the water and it's benefits will be realized by all in the area. And it smells fantastic.
This item comes in a dark glass bottle with a glass dropper, making it easy to use. The dark glass helps prevent effects of light on the product. This bottle, used properly, should last quite a while. It should be stored, preferably, in a dark place (like a kitchen cabinet) at room temperature.