The Lance Armstrong scandal has blown the lid on the world of sports doping. However, a larger problem is at risk of slipping by unnoticed: widespread use of performance enhancing drugs by members of the public.

Government officials estimate up to 160,000 fitness fanatics may be doping in the Netherlands, risking serious health problems, which “often don’t manifest until years after use”.

As the international market is swamped with products manufactured in underground labs, even some dealers are starting to get worried. How big is the problem we will get down the line from these counterfeit drugs? Nobody knows.