Excellent BBC Horizon programme on sports doping, available to watch on iPlayer.

Dr Xand van Tulleken investigates the world of performance-enhancing drugs – from the athletes seeking the rewards of fame, glory and lucrative sponsorship deals to the hundreds of thousands of people in the UK now regularly taking anabolic steroids to look good and buff up. What are these drugs? What do they do to the body? And is it worth it?