2. The main component of vinegar is acetic acid, and the amount of acetic acid contained in vinegar is also different, generally between 5% and 8%. 100g vinegar has only 10 calories, which is very low. It also contains calcium, succinic acid, gluconic acid, malic acid, lactic acid, B vitamins and salts. Among them, 100g vinegar contains 550mg of calcium, which is much higher than milk.