Chloride is one of essential macrominerals. It is an electrolyte that helps maintain proper fluid balance. Chloride enables nerve transmission, and is essential for proper functioning of the digestive tract.
Most common source of chloride is table salt, but it can be found in some vegetables as well, like tomatoes, lettuce, celery, olives, and in dairy products.
Most people get more chloride than they need in the form of table salt, so deficiency is very rare, and it can happen when body loses a lot of fluids. On the other hand, excess of chloride is not that rare, and it can increase blood pressure.