I was wondering where the law stands on advertisers, manufacturers and
promoters who make medical claims for foods and household goods such as
shampoos (typically along the lines of "cures cancer", "reverses baldness",
etc).

Are they merely transgressing advertising codes of conduct, or are there
specific laws in place that prevent, say, all but authorised, tested and
peer-reviewed medicines from attracting this sort of promotion?

Many thanks.

TrentSC