The shelf life of essential oils, carrier oils and massage oils varies greatly, and their life expectancy can be influenced by many different external factors such as:
incorrect light exposure
heat exposure
air exposure
extended storage periods
When oils start the degradation process, hydrolysis (process of breaking the bonds) occurs as well as oxidation.
Unfortunately, due the widespread popularity of essential oils, there is an increased practice of adulteration, which takes on several forms:
A very small quantity can be diluted into a spirit base.
Synthetic aromatic substances can be added, which results in fabricated oils.
A quantity of the main chemical constituent may be added to the essential oils to
‘stretch’ it.
An essential oil from cheaper plant may be added, e.g., lemon to bergamot, or citronella to Melissa.
A substitute oil is used.
Some of the chemical constituents may be removed, these oils are known as fractioned oils.
Factors to consider when purchasing essential oils
It is very important to buy essential oils from a reputable supplier.
The following factors should be considered when purchasing your oils:
Quality
Purity
Price
Odour
Best before date
Origin
Botanical name of plant
Safety
Here are some suggestions on where to purchase your essential oils online:
The Soap Kitchen - https://www.thesoapkitchen.co.uk/
Oils 4 Life - https://www.oils4life.co.uk/
Purple Flame - http://www.purpleflame.co.uk/
Essential Oils Direct - https://www.essentialoilsdirect.co.uk