If you use aromatherapy, understanding a few essential oil safety guidelines is important. The first step is to always read and follow all label warnings and cautions.
Essential oils don't contain fatty acids, meaning they don't become rancid in the way that vegetable oils do. However, light, heat, moisture, and air can cause the quality of essential oils to deteriorate. Protect the oils by storing them in dark glass bottles, tightly sealed, away from heat.
If you properly store authentic essential oils, most of them can retain their quality for years (low-quality or adulterated oils will go bad more quickly). The exception is citrus oils, which may only remain good for 6 to 12 months after opening.
In guidelines for using essential oils, you will often see the recommendation that you always dilute the oils before using them on your skin. However, it depends. Many sources acknowledge that you can safely use a few oils, such as lavender and tea tree, "neat" (directly on your skin) if you aren't sensitive to the oil and it's an authentic, not adulterated, oil.
Other sources discuss using a wider range of essential oils without dilution. However, you must know enough about a particular essential oil and your possible sensitivity to it to make a decision. If in doubt, dilute using these guidelines:
Before using a new essential oil, skin test it. Dilute a drop of essential oil in a carrier oil that you know you can use and apply the blend to the skin on your inner arm. If redness or irritation develops, don't use the oil.
If you're highly sensitive, you might want to use this more extensive test:
At any time, even if you have previously used an oil without a problem, if redness, burning, itching, or irritation occurs, stop using the essential oil immediately. Apply a carrier oil to your skin to help relieve the irritation.
Also, keep oils away from eyes and mucous membranes. If essential oil gets into your eyes, flush with lots of carrier oil immediately. (Water may worsen the irritation.)
Use essential oils internally only with professional guidance. Not all essential oils are safe for internal use, and you must know for sure that you are using a genuine, authentic essential oil. Internal use of adulterated oils may be dangerous.
Ideally, consult a professional before using any essential oil while pregnant. Pregnant women should avoid some oils completely, such as peppermint, clary sage, rosemary, and wintergreen. See this article for more about aromatherapy during pregnancy.
When you use angelica or most cold-pressed citrus (orange, grapefruit, lemon, etc.) oils, your skin becomes more sensitive to ultraviolet light for 24 to 72 hours. Avoid being in the sun or using a tanning bed after applying these oils to your skin.
Note that lime and lemon also come in distilled versions that do not cause sun sensitivity. Bergamot is also available in two versions, one which causes sun sensitivity and a begaptene-free version that does not.
If you have a serious medical condition, some essential oils may be inappropriate or cause an adverse drug interaction. Get professional advice. Essential Oil Safety: A Guide for Health Care Professionals is a good resource.
Don't buy perfume or fragrance oils if you want the benefits of essential oils. Also, carefully select where you purchase your essential oils. The quality of essential oils varies widely from company to company, and some companies try to pass off adulterated oils as genuine. (My recommendation for buying essential oils.)
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