Slow-K is a brand name for potassium chloride, which is a medication used to treat low levels of potassium in the body. It works by providing the body with a source of potassium, an essential mineral that helps with various bodily functions. When you take Slow-K, the potassium is absorbed into your bloodstream, helping to balance your potassium levels and support normal nerve and muscle function. It's important to take Slow-K as directed by your healthcare provider to avoid either too much or too little potassium in your system, as both can be harmful.