If properly cared for, many essential oils can have a shelf life up to seven years or longer.
Most essential oils and essences do not go rancid like vegetable oils. Essential oils they just lose their potency and can smell “off”. There are a select few oils (such as jasmine) that can smell really off as they age, but these are rare.
Citrus oils are the first to lose their potency; if opened regularly they could lose their potency in 5 – 12 months.
Avoid touching the essential oil dropper to the skin ; this can cause a build-up of bacteria, decreasing potency and causing a scent change.
Keep essential oils in a dark place out of direct sunlight or any direct source of heat – the fridge is an ideal place! Avoid bathrooms, as these have regular temperature changes that harm essential oils.