Isopropyl alcohol (also known as isopropanol) is included as a carrier and solubilizer. Its primary role is to help the natural eucalyptus essential oil mix evenly with the water base, preventing the oil from separating and floating to the top of the bottle. This ensures you get a consistent concentration of aroma in every use. It also acts as a mild preservative, helping to maintain the product’s integrity during storage. Isopropyl alcohol is a common and safe ingredient in many topical and aromatic formulations when used as intended—in this case, highly diluted in a large volume of water and vaporized by heat or dispersed in a bath.
The alcohol content evaporates quickly when the product is mixed with hot water and turned to steam or added to a bath. It is not intended for direct skin application in its concentrated form. As with all products containing essential oils, it’s important to use only as directed—diluted—and to avoid contact with eyes or mucous membranes. If you have specific allergies or sensitivities to alcohols or eucalyptus, it’s prudent to test a small, diluted amount first or consult a specialist.