Essential oils are highly concentrated products, that can be harmful if not used carefully.
When in doubt, consult your physician and/or a qualified aromatherapy practitioner.
There are instances when experienced aromatherapy users and practitioners make exceptions, however, the safest rule is that essential oils should not be used undiluted on the skin.
Some oils can cause allergic reactions or sensitization in some individuals. When using a new oil topically for the first time, perform a skin patch test on a small area of skin with 1% dilution in a carrier oil. If no irritation occurs after 24 hours, the essential oil should be safe for you to begin using diluted on your skin.
Some essential oils should be avoided during pregnancy or by those with various health conditions. Research the safety precautions associated with each essential oil that you use.
Some essential oils are phototoxic and can cause irritation, redness or burning when the skin is exposed to UVA rays. More information on the essential oils product sheet.
Essential oils are highly concentrated and should not be ingested without guidance by a qualified practitioner or until you have gained adequate knowledge.
Infants, toddlers, and young children are more sensitive to the potency of essential oils. Keep all essential oils out of reach of children. Certain essential oils should either be avoided, used in highly diluted form under the guidance of a knowledgeable professional.
Keep essential oils away from the eyes.
Essential oils are highly flammable substances and should be kept away from direct contact with flames.
Learn more about: How to Use Essential Oils Safely from Tisserand Institute