In one case, a 14-year-old girl developed erosions on her nose after applying several drops of apple cider vinegar to remove two moles, based on a protocol she’d seen on the internet ( 21 ).
Bunick CG, Lott JP, Warren CB, et al. Chemical burn from topical apple cider vinegar. J Am Acad Dermatol 2012;67(4):e143-4. View abstract.
The people who consumed a drink containing 25 grams (0.88 ounces) of apple cider vinegar reported less appetite but also significantly greater feelings of nausea, especially when the vinegar was part of an unpleasant-tasting drink ( 14 ).
1. Delayed stomach emptying.
A case study also concluded that a 15-year-old girl’s severe dental decay was caused by consuming 1 cup (237 mL) of undiluted apple cider vinegar per day as a weight loss aid ( 18 ).
The National Capital Poison Center lists a number of medical reports in which people experienced serious burns that required medical treatment after using vinegars, including apple cider vinegar, on the skin.
Vinegar is used in cooking, baking, and salad dressings and as a preservative. There’s a lot of acid in it, so drinking vinegar straight isn’t recommended. It can cause problems, like eroding the enamel of your teeth, if you get too much.