Hypochlorous acid (HOCl) is a natural substance produced by your white blood cells to fight infections by killing bacteria, viruses, and fungi; it’s also made in labs for use in wound care, skin sprays, and disinfectants because it effectively cleans wounds and surfaces without harming human cells. It’s very gentle on the skin, eyes, and mucous membranes, making it safe for medical and personal use in low concentrations, helping reduce infections and promote healing.