What is the best way to store the 10 ml bottle to keep it effective?

The 10 ml bottle of Medikomed Tea Tree Essential Oil should be kept in a cool, dry place away from direct heat or sunlight, because temperature fluctuations can accelerate the breakdown of the volatile aromatic molecules that give the oil its characteristic scent and activity. After each use make sure the cap is screwed on tightly to limit oxidation, and consider writing the opening date on the label so you can track the typical 12‑month usable window for pure essential oils. If the oil develops a noticeably darker colour, a thickened texture, or an off‑smell, it is a sign that the product has begun to degrade and it is best to discontinue use. The oil is not intended for ingestion, and it should always be kept out of reach of children and pets, especially since even small amounts can be irritating if swallowed. If you are pregnant, breastfeeding, have a chronic skin condition or are taking medication, consult a qualified specialist before using the oil.