Opened to smell, otherwise nearly full, stored in a cool dry place. Revive produces 100% pure therapeutic grade essential oils, GS/ MS tested with 20 purity tests, and grown indigenously ✨ Melissa also known as lemon balm is rare and expensive, relaxing and is believed to promote wellness and immune health and even a good nights sleep. Revive recommends diffusing or add a drop or two to a compress to calm the mind.