Practitioners of mainstream medicine are increasingly recognising that complementary therapies, such as acupuncture and herbalism, have much to offer in treating specific ailments. Anecdotal evidence can also be strong, but how can you be sure that they really work? The answer is that we don't know because the industry is less regulated and researched than conventional medicine. In the end, it's up to you to give natural therapies a go and then decide whether they are working. Here is a guide to a few common practices.