How should I store the bottle, and does the oil have a shelf life or particular signs that it's gone bad?

Store the bottle in a cool, dry place away from direct sunlight and heat sources, like a bathroom cabinet or bedroom shelf. Exposure to heat, light, and air can accelerate the natural oxidation of the plant oils in the blend. While not all oils have a printed expiration date, a typical shelf life for such products is around 12-24 months after opening if stored properly. Signs that the oil may have deteriorated include a noticeably rancid or off smell (different from its original herbal aroma), a significant change in color, or a change in consistency, such as becoming unusually thick or sticky. If you observe any of these changes, particularly an unpleasant odor, it's best to discontinue use. Always ensure the cap is tightly closed after each use to minimize air exposure.