Black rock salt is also known as kala namak

Black rock salt can be low in sodium level 

Kala namak can mostly be effective in treating acidity, eliminates bloating & gastric symptoms

Because of less sodium content, it can facilitate in normalizing the blood pressure 

Black salt / Kala namak can have fewer additives than regular table salt 

Black salt can be essential in minerals 

Black salt can be consumed as an alternative for table salt for individuals whose blood pressure is generally high because table salt generally is high in sodium 

Can control some level of cholesterol in the body by washing out toxic and stored fat 

Black salt can also be good for diabetics if taken in balanced quantity as it helps in maintaining sugar level in the body