Longan well vinegar is a traditional vinegar in China, which is made from high-quality Longan well tea by aging. Under normal circumstances, aged longan vinegar is edible and widely used in many food cultures in China. Longan well vinegar itself does not contain harmful substances and will not cause harm to human body. However, if the quality is poor, the production is not standardized or improperly preserved, it will have some negative effects, such as mildew and rancidity.