Which of the following is a common antiseptic used in cosmetology?

Alcohol is widely recognized in cosmetology as a common antiseptic due to its ability to effectively kill bacteria and viruses on the skin. It works by denaturing proteins and disrupting cellular membranes, making it an excellent choice for disinfecting tools and surfaces in a salon environment. Its quick evaporation rate also means it does not leave a residue, which is an advantageous property when preparing skin for various treatments.

While hydrogen peroxide, witch hazel, and saline solution may have antiseptic properties as well, alcohol is preferred in many cosmetic and skincare applications for its effectiveness and fast-acting nature. Hydrogen peroxide can also serve as a disinfectant but is often less favored due to its potential to irritate the skin. Witch hazel is often used more for its soothing properties than as a primary antiseptic. Saline solution is primarily used for irrigation rather than as a disinfectant. Hence, alcohol stands out as the most common antiseptic in the field of cosmetology.