How do I store the 1 L bottle to keep the oil fresh and the lavender scent stable?

Vegetable oils and lavender fragrance are both sensitive to oxidation, which accelerates with heat, light, and air contact. Store the original 1 L bottle in a cool, dark cupboard (ideally below 25 °C) with the cap screwed on tightly after each use. For salon or frequent home use, pour a week's supply into a smaller opaque pump bottle or dark glass dispenser; this reduces the number of times the large bottle is opened and limits the headspace where oxygen can degrade the oil. If the oil develops a rancid, waxy, or sharply alcoholic off-note, or if the lavender aroma fades to a flat herbal smell, it has oxidized and should be replaced. The product is for external cosmetic use only and does not contain preservatives designed for indefinite shelf life once opened; typical period-after-opening for fragranced massage oils is 6–12 months under good storage conditions.