Why Essential Oils Degrade Over Time Essential oils do not spoil in the way milk or bread does, turning moldy or sour. When the complex molecules within the oil are exposed to oxygen, they slowly break down and change structure.
Understanding the Oxidation Process Behind Oil Expiration
Similarly, storing oils in warm environments, such as above a stove or in a sunny window, increases the internal pressure of the molecules, causing them to degrade at a much faster rate. Meanwhile, base notes such as Sandalwood, Patchouli, and Vanilla can often remain stable and aromatic for 4 to 5 years or longer.
These variations are determined by the specific chemical constituents inherent to each botanical source. While often celebrated for their potency and immediate effects, these volatile liquids undergo chemical changes over time, influenced by factors such as oxidation, light exposure, and temperature.
Understanding the Oxidation Process Behind Essential Oil Expiration
Clear or translucent bottles, while aesthetically pleasing, act like a magnifying glass for damaging rays, accelerating the breakdown of delicate compounds. Furthermore, the evaporation of the most volatile constituents, known as terpenes, weakens the oil's therapeutic properties, leaving behind a less effective version of its former self.
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