It depends on what is causing the bloating. Gas produced by bacteria in the intestine can be a major contributor to bloating. If this is the cause of your bloating, several clinical trials have shown that probiotic supplements can help reduce both gas production, as well as bloating, in people affected digestive problems. Probiotic supplements have several other benefits so they are a good option.
You may also want to consider a Digestive Enzymes supplement. Digestive Enzymes can help break down indigestible carbohydrates and, in some cases, provide almost instant relief for bloating.