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Home Page > Aromatherapy Articles & Guides > Verifying Essential Oil Quality > Quality vs. Purity - Aren't They the Same Thing?

Quality vs. Purity - Aren't They the Same Thing?

An oil can be pure while simultaneously being of poor quality. By holistic aromatherapy standards, an oil that is not pure is clearly considered of poor quality.

What Affects the Quality of Essential Oils?

The aroma and exact percentage of each natural constituent contained in a particular pure, unadulterated essential oil can very depending on a variety of factors:

  • Quality of the soil the botanical is grown in
  • The amount of rainfall
  • The temperature/climate
  • The altitude
  • The way the botanical is harvested
  • The way the botanical is stored prior to distillation
  • The length of time that passes between when the botanical was harvested and when it is distilled into an essential oil
  • The exact part of the plant used in the distillation of the oil
  • The type of distillation equipment being used including the material it is made out of (i.e. copper vs. steel components)
  • The storage conditions of the essential oil
  • Any adulteration/tampering with the essential oil

What Affects the Purity of Essential Oils? How are Essential Oils Usually Adulterated?

An adulterated essential oil is one that has been tampered with in some way. The common ways that essential oils are adulterated are as follows:

  • Blending/combining other less expensive essential oils and fraudulently marketing the oil as a pure, more costly oil. (i.e. the Yuzu essential oil example mentioned previously
  • Blending a higher quality essential oil with a lower quality version of the same species
  • Adding individual constituents, whether naturally or synthetically derived, to an essential oil
  • Adding synthetics to improve the aroma
  • Adding vegetable (carrier) oils and not disclosing the dilution to the end consumer (This can be easily detected by the consumer by simply placing several drops of the oil on a tissue or perfumery blotter and waiting for the oil to dry out. If an oily ring remains, the essential oil has been diluted in a vegetable oils.


This topic consists of several separate related articles. Use the links shown below to navigate through the series.

Next: Part 6: Quantifiable Testing of Essential Oils


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Wendy Robbins (Cert. Aroma ACHS), Founder of AromaWeb, is a Professional Level Member of the Alliance of International Aromatherapists and the National Association for Holistic Aromatherapy.

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