How should I store this oil after opening to keep it fresh?

Proper storage is key to maintaining the quality and taste of this unrefined walnut oil. Like all cold-pressed oils rich in unsaturated fats, it is sensitive to factors that can cause rancidity, such as light, heat, and oxygen. After opening, always tightly seal the bottle to minimize air exposure.

Store it in a cool, dark place such as a kitchen cupboard or pantry, away from direct sunlight, stovetops, ovens, or other heat sources. A consistent, cool temperature is ideal. Refrigeration is not strictly necessary but can further extend freshness, especially in warm climates; if refrigerated, the oil may become cloudy or thicken slightly, but this will not harm it and it will return to its normal state at room temperature. Use the oil within a few months of opening for the best flavor, and always check for any off-odors (like a sharp, paint-like smell) which indicate spoilage.