How long do essential oils remain effective?
Written by
Tran Quang
Reviewed by
Prof. Benjamin Murphy, Ph.D.The quality of essential oils can be preserved depending on their chemical composition and how the oils are stored. Lemon and orange oils quickly deteriorate due to the presence of numerous volatiles in the oils. Cedarwood and other woody oils remain potent for longer periods. If stored properly, essential oils remain effective for a significantly longer period. I keep a record of the opening dates on the labels of the oils.
Storage Solutions
- Use dark cobalt or amber glass bottles exclusively
- Maintain consistent temperatures between 50-68°F (10-20°C)
- Fill containers to minimize air space oxidation
- Install UV-protective film on storage cabinets
Degradation Indicators
- Noticeable viscosity changes like thickening
- Cloudy appearance indicating oxidation
- Rancid or significantly altered aroma
- Color darkening beyond normal parameters
Usage Strategies
- Rotate citrus oils every 12-18 months
- Use oxygen-absorbing caps for precious oils
- Store oils in smaller containers as levels drop
- Label bottles with opening dates clearly
Check for signs of oldness before using aged oils. Cloudiness indicates that the citrus oils have oxidized. A thickness in the consistency suggests that the resins have evaporated. Rancid odors suggest that the floral oils are spoiled. A color change denotes decomposition. I discard oils that exhibit these changes immediately.
Understanding the importance of storage for problems with potency, heat causes molecular breakdown in the substances (or compounds) that produce the volatility. Light causes photochemical reactions that create changes in their chemistry. Ultraviolet rays react with all gases to produce oxidation, which depletes the value of these same gases. My oils have been known to last significantly longer since I had a separate cooling compartment installed.
Put in place rotation systems for various oil genres. Use citrus oils within 18 months of purchase. Save the multiple wood oils and resins for later use. Group the oils according to periods of effectiveness. Keep track of usage in an oil log. My system avoids waste and retains therapeutic effects.
Read the full article: Aromatherapy Essential Oils: Benefits & Uses
