Menthol is in certain OTC remedies, such as vapor rubs, lozenges, and nasal inhalers. Because oregano oil has antibacterial and antifungal properties, it may help sinus congestion in theory.
If not cleaned properly, they can become breeding grounds for mold and bacteria, which can worsen respiratory issues. Overuse of steam inhalers can lead to burns, so caution is needed. It's ...