A water ionizer (also known as an alkaline ionizer) is a home appliance which claims to raise the pH of drinking water by using electrolysis to separate the incoming water stream into acidic and alkaline components.
The fact that this type of water has a higher pH level has led some people to believe that it may help neutralize acid in the body, help slow the aging process, or even prevent cancer.
There’s very little scientific proof, however, of this being true.
It’s generally safe to drink alkaline water, but it could reduce stomach acidity, thereby lowering its ability to kill off harmful bacteria.
In excess, it could also lead to metabolic alkalosis, which could produce symptoms like nausea and vomiting.