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Guidelines for Using Essential Oils and Herbs
Safety Precautions
Because essential oils are concentrated, highly potent substances, a working knowledge of how to use them safely is vital to the success of your efforts. The potential hazards of an essential oil depend on the compounds in the oil, the dosage and frequency used, and the method of application. Here are a few guidelines to ensure safe and effective use of essential oils:
Don't use undiluted essential oils on the skin. They can cause burning, skin irritation and photosensitivity. There are a few exceptions to this rule: it is acceptable to use the nonirritating oils lavender or tea tree undiluted on burns, insect bites, pimples and other skin eruptions-as long as you don't have extremely sensitive skin. If you find an essential oil irritating but would like to use it, and have determined that the irritation is not due to an allergy, try massaging the diluted blend into the soles of your feet. The oil will not irritate the skin, and will still enter the body.
Use only pure essential oils from plants.
Test for sensitivities. Most people with sensitivities to synthetic fragrances are not sensitive to high-quality essential oils. Also people who are allergic to, say, chamomile tea will not necessarily be allergic to the essential oil. If you are uncertain about an oil, do a patch test of a 2-percent dilution in the crook of the arm or on the back of the neck at the hairline. Twelve hours is ample time for a reaction to occur. If redness or itching develops, you may want to try a less potent dilution, or choose an appropriate substitute for the irritating oil.
Use with caution those essential oils that result in photosensitivity. Citrus oils can irritate skin, and some of them will cause uneven pigmentation of the skin upon exposure to sun lamps or sunlight. This is especially true of bergamot, which contains bergaptene, a powerful photosensitizer that will cause allergic reactions in some individuals. (Bergaptene-free oil is available.) Of the citrus oils, bergamot is the most photosensitizing, followed by cold-pressed lime, bitter orange, and to some degree, lemon and grapefruit. Of the lemon oils, California oil is the least photosensitizing. If you are using photosensitizing oils on your skin, do so at night, stay indoors, or wait at least four hours before exposing your skin to ultraviolet light.
Use with caution those essential oils that are irritating to mucous membrane (the lining of the digestive, respiratory and genito-urinary tracts) and skin. Keep all essential oils away from the eyes.
Keep all essential oils out of the reach of young children; older children can be taught to respect and properly use essential oils, but they should nevertheless be supervised. In general, when treating children with essential oils use one-third to one-half the adult dosage and select only nontoxic oils. Among the best and safest essential oils for children are lavender, tangerine, mandarin, neroli, frankincense, petitgrain and Roman chamomile.
Vary the essential oils you use. Using the same facial oil blend for a long period of time is acceptable because it covers a very small part of the body, but daily application of the same blend of oils over your entire body for more than two weeks is not recommended. It is wise to alternate with a blend of different oils containing different chemical constituents at least every two weeks. Uninterrupted use of some oils exposes your liver and kidneys to chemical constituents that may be harmful over time. Rotating the oils gives your body time to process them and allows each oil to work on different levels in its own unique way.
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Copyright © 1995
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Kathi Keville has studied herbs since 1969. Her attraction to fragrant plants led to an involvement in aromatherapy. Her other books include Herbs for Health and Healing; The Illustrated Encyclopedia of 
