The purity and quality, and hence the therapeutic efficacy of an essential oil is much more nuanced than most essential oil companies will have you believe. Many of the differences in composition are very easily explained from one distillation batch to another. If all the parties involved understand these differences, the customer will have a greater understanding of the choice that they have when purchasing the desired oil.
The purest essential oil is one that has been harvested and extracted using the correct methodology. A pure oil maintains a level of chemical composition that is within a certain acceptable range that would rule out adulterations of any kind.
The quality of an oil is gauged from therapeutic viability and aroma profile (organoleptic properties). In an extreme example, an oil could potentially be entirely synthetic and adulterated but still be considered as a higher quality than the pure form of that oil just based on its chemical compounds.
One potential variance that effects chemical components is the weather or season for that particular harvest. This comes about mostly from temperature changes and moisture differences in soil.
Another parameter that effects oil quality is the human element. Humans will sometimes unintentionally vary the time during the extraction process (time it takes from extraction to bottling). The time to bottling greatly changes composition in some cases. For example, the timing on Rose Otto oil is extremely sensitive and can cause large percentage swings in citronellol and other constituents in the oil. Choosing the highest quality of an essential oil is understanding all of these parameters and ensuring that the best parts of an oil's chemical composition are present. Here at The Ananda Apothecary, we strive to be transparent and provide complete data on all of our oils' constituents and allow our customers to choose which oil is best for their specific situation. We believe in finding the highest quality oils by constantly monitoring all of the factors that go into truly great products.
Learn more about how we ensure the quality of our oils by visiting our GCMS & Laboratory Analysis page.