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ALWAYS look for an essential oil that is of therapeutic grade and safe for internal consumption, sometimes referred to as Generally Recognized As Safe (GRAS), my favorite line of oils is Young Living Essential Oils which are grown from non-genetically modified (GMO) seeds and using organic weed and pest control.
NOTE: Other brands may include filler chemicals that dilute the oil and are not as safe for internal or topical application.
If you get an oil in your eye do not flush with water but rather use a vegetable oil such as olive oil and flush liberally.