How should I store the bottle and how long is it usable after opening?

Vegetable-oil-based massage oils are prone to oxidation when exposed to heat, light, and air. Store the 250 ml bottle upright with the cap screwed on tightly, ideally in a cupboard or drawer away from radiators, windows, and direct sunlight. A bathroom shelf is acceptable only if the room stays cool and the bottle is not left open during showers. Most cosmetic oils carry a period-after-opening (PAO) symbol — typically 6 or 12 months — printed on the label or carton; follow that timeframe. Over time the oil may develop a rancid, crayon-like smell or become noticeably thicker; these are signs it has oxidized and should be discarded. Do not transfer the oil to a clear glass bottle unless it is amber or cobalt blue, and never add water or other liquids, which accelerate spoilage. If the product looks and smells normal but you are past the PAO window, it is safer to replace it.