The article text provided does not contain the actual story about the prostate cancer therapy — instead, it consists only of the Daily Mail website's navigation menu and a list of unrelated headlines from other sections of the site. As a result, no substantive details about the treatment, its effects, or Jeremy Clarkson's involvement are available to summarise.

To provide an accurate summary of this story, the full article text would need to be retrieved, as the current content does not include any information about the therapy itself, how it reduces side-effects, or the medical context behind it.