Hydrosols are produced by the steam
distillation of a particular plant and therefore contain only water soluble
plant constituents. Their fragrant aroma is
due to the presence of a small amount of volatile essential oils.
Hydrosols can possess a variety of beneficial qualities such as anti-bacterial or anti-inflammatory. They are considered mild and unlikely to cause skin irritation, allergic reactions, or harmful interactions with other substances. Hydrosols are commonly used externally in aromatherapy, for deodorizing and freshening, and as an ingredient in some personal care products such as aftershaves, deodorants, salves, creams, lotions, etc. Hydrosols have also been used internally both as medicine and as flavoring for foods or beverages.