Definition of common for Students. 1  1 : affecting, belonging to, needed by, or used by everybody for the common good a common room. 2  2 : shared by two or more individuals or by the members of a family or group a common ancestor. 3  3 : 1general 1 common knowledge. 4  4 : occurring, appearing, or used frequently a common sight a common name.
1 Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat. Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat.
Apple Cider Vinegar and Acne. Next to water, the most prominent ingredient in apple cider vinegar is acetic acid. Table vinegar may contain 4 to 8% acetic acid, while pickling vinegar contains up to 18% acetic acid. The acetic acid in apple cider vinegar gives it a pH of 4.2 to 5. There is considerable evidence that apple cider vinegar can kill the food borne bacterium E. coli, source of stomach upset, diarrhea, and, in some cases, kidney damage. There isnât any scientific evidence that it can kill acne bacteria.