Vinegar has been used as a remedy since the days of Hippocrates. The ancient Greek doctor treated wounds with it. In recent years, people have explored apple cider vinegar as a way to lose weight, improve heart health, and even treat dandruff.Many of these claims aren't supported by modern research. But some studies have found that acetic acid -- which gives vinegar its distinctive taste and smell -- may help with a variety of conditions.One small...