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Following the recent stories about doping in sport, Dr Xand van Tulleken investigated performance-enhancing drugs for BBC2's Horizon programme.

As part of the programme, Dr Mayur Ranchordas, sports nutritionist at Sheffield Hallam, discussed the impact caffeine can have on sporting performance - with the presenters taking part in a live test to witness the impact for themselves.

Dr Mayur Ranchordas on Horizon

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