Certain guidelines for safe and proper use of essential oils should be followed:

• Prevent vapours entering the eyes, but if in case it happens, wash with cold water.
  

• Before applying the essential oil to the skin it should be thoroughly mixed with carrier oil, to prevent the possibility of skin irritation. If any skin irritation occurs, dilute it with some more carrier oil. If irritation persists, then discontinue the use of  the formula. 
  

• Certain essential oils should not be used during pregnancy due to the stimulating effect on the urinary system and uterus.
  

• Selection of essential oils is very important for women nursing their babies because the effects of the oils are transferred to the infant.
  

• To check allergy, rub a drop of carrier oil on the chest and check for any reaction or redness after 12 hours. If  clear, add a drop of essential oil to 20 drops of same carrier oil used earlier and rub it on the chest. If no reaction is found on the skin after 12 hours, the particular essential oil and carrier oil is safe for use. 
  

• Alcohol consumption should be prohibited during the use of essential oils.
  

• Use of the essential oils should be avoided during any ongoing medication.
  

• Some oils should be used with utmost care, especially by those people who have  a dry skin, as it may be irritating to the skin. For instance, Cinnamon leaf, Clove bud, Fennel, Gingergrass, etc.
  

• Avoid sunbathing or using the sauna or steam room for at least four hours if you are using citrus, photo toxic, and other essential oils which irritate the skin.
  

• People with extremely sensitive skin should discontinue use of essential oils if it becomes intolerable.