The main ingredient of apple cider vinegar, or any vinegar, is acetic acid.  However, vinegars also have other acids, vitamins, mineral salts and amino acids.

Apple cider vinegar may be helpful to diabetics because it may help lower blood sugar. Here are some ways in which apple cider vinegar can be beneficial to people with type 2 diabetes. It can reduce fasting blood sugars and improves insulin sensitivity during a high-carb meal by 19-34% and significantly lowers blood glucose and insulin responses

Studies have been done and found that drinking water with apple cider vinegar daily can help contribute to weight loss. Apple cider vinegar can help you feel fuller longer, which will help you eat fewer calories.

Apple cider vinegar can also help with digestion and heartburn problems by lowering acid in the stomach that can lead to heartburn. The fiber found in the apples that make the vinegar helps to soothe the gastrointestinal tract. Not only will drinking some before each meal help with the heartburn side effects, but it will also help stimulate your digestive juices which helps break down the food. 

The malic acid found in raw, organic apple cider vinegar is known to also aide the immune system.