Over time, oxidation can lead to the formation of new compounds, sometimes resulting in a harsh, rancid, or simply off-putting scent. Light exposure: UV light breaks down compounds, especially in citrus oils.
Understanding Essential Oil Degradation and Shelf Life Factors
This degradation can alter their scent, reduce therapeutic benefits, and, in some cases, cause skin irritation. Visual cues can also signal degradation, such as cloudiness, discoloration, or the formation of sediment at the bottom of the bottle.
Citrus oils, such as lemon, lime, and grapefruit, are particularly susceptible to oxidation due to their high limonene content and typically have a shorter shelf life. The Science Behind Essential Oil Degradation The primary culprit behind essential oil expiration is oxidation.
Understanding How Oxidation, Light, and Heat Cause Essential Oil Degradation
Heat: Warm environments speed up the degradation process. Essential Oil Category Typical Shelf Life Examples Citrus Oils 1 to 2 years Lemon, Orange, Grapefruit Monoterpene-Rich Oils 1 to 3 years Peppermint, Pine, Tea Tree Sesquiterpene-Rich Oils 4 to 8 years Sandalwood, Cedarwood, Frankincense Phenolic-Rich Oils 4 to 6 years Oregano, Thyme, Clove Signs Your Essential Oil Has Expired Determining whether an essential oil has passed its prime requires attention to sensory changes.
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