r pure, natural and organic oils are undiluted, unrefined and cold pressed. They are strictly free of mineral oil or petroleum derivatives to improve shelf life. Most vegetable oils oxidize over time and eventually become rancid. Keep them away from moisture or any kind of water contamination. When you pour the oil into your palm each time, make sure that your palms are dry, so as to not let any kind of water to come in contact with oil. For example pure, unrefined Coconut Oil can get easily rancid with slightest of water or moisture contamination. You need to make sure that the cap is closed tightly after each use. Since they are all natural and preservative free, to achieve the best potency please use our oils within 4 5 months after opening. You may refrigerate them to extend the shelf life after opening. Place the bottle towards the back of the refrigerator, away from the door to avoid outside temp changes affecting it. Oils might turn cloudy due to refrigeration, but not to worry their quality will remain unaffected. Just place the bottle in a bowl of warm water to regain consistency.DO NOT PUT OIL in FREEZER!!!