How should I store the 1 L bottle to keep the oil fresh and effective over time?

Vegetable oils oxidize gradually when exposed to light, heat, and air, which can cause rancidity — noticeable as a stale, crayon-like smell and a heavier, tackier texture. Store the original 1 L bottle in a cupboard away from radiators, windows, and direct sunlight, ideally below 25 °C. Always screw the cap on tightly after each use. For daily convenience, decant a week’s worth into a smaller amber or opaque pump bottle; this reduces how often the large container is opened and limits the headspace air that accelerates oxidation. If the oil develops an off odor, changes color significantly, or feels sticky instead of silky, it has likely oxidized and should be replaced. Shaking before each use (as the label directs) redistributes any settled fragrance or natural particulates but does not reverse oxidation. With proper storage, a typical cosmetic oil blend remains stable for 12–24 months after opening; check the period-after-opening symbol (open jar icon with a number) on the label for the manufacturer’s specific guidance.