Rosemary oil does not necessarily need to be refrigerated, but it can help extend its shelf life. Essential oils, including rosemary oil, are generally quite stable and can be stored at room temperature in a cool, dark place away from direct sunlight. However, if you live in a particularly hot or humid climate, refrigeration can help slow down the oxidation process and preserve the oil's freshness for a longer period.

It's important to note that refrigeration may cause the oil to solidify or become cloudy, but this is normal and does not affect its quality. Before using refrigerated rosemary oil, make sure to bring it back to room temperature and gently shake the bottle to mix any separated components.

If you choose to refrigerate your rosemary oil, ensure it is stored in an airtight, dark glass container to protect it from light and moisture. Additionally, always check for any signs of spoilage, such as a rancid smell or a change in color or consistency, before using the oil on your skin.

Remember, proper storage and handling of any skincare product, including rosemary oil, can help maintain its potency and efficacy over time.