All those 'cholesterol-reducing' yogurts etc ...

[NotQuiteCockney]

Do they actually do anything?

(My cholesterol is fine, afaik. They just seem like rubbish to me, and I was wondering if there was actual science for them ...)

I think there is evidence that they can help.See here.

Ah, right, well, that's reasonably convincing, and from a good body. Of course, the person I know who's using them is ignoring the 'healthy diet blah blah blah' part, by and large.