Shelf Life and Storage from the time of distillation:
It is impossible to say exactly what an essential oil shelf life will be. The storage conditions will vary and make a significant difference. If the essential oil has been received directly from the distiller shortly after distillation and the glass bottle is kept dark, full, closed, and cool, we can make some generalizations. Please note these are simply Aromatics Internationals opinions based on experience and an understanding of the chemistry of each oil.
Note that if an essential oil begins to appear cloudy, thicker, or if it smells more acidic, it has likely begun to oxidize.
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General shelf life from a chemical family perspective: