How should I store this bottle to keep the oil fresh, and how long will it last?

To maintain the quality of your coriander essential oil, store the bottle upright in a cool, dark place away from direct sunlight, heat sources like radiators, and humidity. Keep the lid tightly closed when not in use to minimise oxidation and evaporation of the volatile aromatic compounds. A cupboard or drawer is ideal. Under these conditions, an unopened bottle can typically last for several years. Once opened, try to use it within 1–2 years for best aromatic potency, though it may remain usable longer if stored well. The oil may slowly darken over time, which is normal for natural products. Always check the oil before use; if the scent has changed drastically (become sour or flat) or if cloudiness appears, it's best not to use it. Do not transfer the oil to plastic containers, as the concentrated oil can degrade certain plastics.