Can you recommend alternatives to wheat bran cereal?

I currently eat Bran Flakes every morning as they help to keep me regular. This has worked really well for me. However I have separately been diagnosed with a wheat intolerance and the bran used in Bran Flakes and most other bran cereals is wheat bran. Can anyone suggest any cereals or other solutions that would help to keep one regular? Does rice bran have the same beneficial effects as wheat bran? TIA