Acetic Acid Bad Irritant No known benefits Acetic Acid at a glance Byproduct of fermentation Main component of vinegar aside from water Used to adjust skin care products’ pH Has mild antimicrobial properties Overuse or misuse can result in skin damage Acetic Acid description Acid found in vinegar, some fruits, and human sweat. It can be sensitising to skin, though it also has disinfecting properties.