Tuesday 26th February 2008, 9pm, BBC Two

Friendly bacteria, superfoods, cholesterol busting spreads, 99% germ free, whiter than white...it's almost impossible to find a product in the supermarket today that doesn't come with impressive claims...scientific claims...with an inflated price tag to match. Are they oversold? Or are they worth the extra cash?

Prof Lesley Regan has already exploded some of the myths behind beauty products in a previous Horizon. Now she's back, to see if the evidence behind these supermarket products stands up to her levels of scrutiny.

From organic farm produce to the billion dollar brands of the UK's major manufacturers Prof Regan asks tough questions and gets surprising answers. And there's no sitting on the fence: a product is either 'in' or 'out' of her scientifically backed supermarket trolley.