• They can go rancid and lose their potency, too, due to degradation from light, humidty and air.
  • Good question. I have about 20 books and none give an answer that is exact. I have read that the citrus oils such as lemon, lime, orange, etc do not last more than a year so use them for cleaning when it gets close. Some of the other oils get better with age. I refrigerate the ones that I do not use as much and switch them to a smaller bottle. Oxygen will make them go rancid quicker. If you find an answer let me know for I have over 100 bottles of essentual oils.
  • They do have an expiration date.
  • They are affected by oxygen, light and heat. Here's the breakdown:

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