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Obstacles to research in complementary and alternative medicine

ABOUT HALF THE general population in developed countries uses complementary and alternative medicine (CAM).1 Yet many conventional healthcare professionals refuse to take CAM seriously — one often-voiced argument is “there is no research in CAM”.2 Certainly, for some modalities there is no compelling evidence base,3 and some of the research into CAM has methodological flaws and biases.4,5 On the other hand, many doctors and medical educators are uninformed about the quality evidence that does exist. In this article, I discuss some of the obstacles to developing an evidence base for CAM.