There are many salt substitutes out there on the market, but you need to be careful, because some of them contain alternative types of chlorides; depending on the health issue you're faced with, they may still present a health problem. I recommend simply cutting back on your salt intake in a gradual manner. Many people I know say that once you get used to going without salt, you don't miss it anymore. Try to add more flavor in other ways, such as with fresh or dried herbs and spices or salt-free spice blends. Another trick is to add a little lemon juice or vinegar to a dish to bring out the flavor. A couple of drops will usually do the trick.