Cranberries have been used for centuries. They are native to North America and were used by Native Americans. Early settlers from England then learnt to use the berry both in its raw and cooked forms. Cranberries naturally contain substances referred to as proanthocyanidins; it is these substances that give them their vibrant colour. Cranberry supplements enable you to receive all the benefits of concentrated cranberry, without the unnecessary sugar found in commercial cranberry juices.