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The truth behind vitamins and supplements, whether we need them and which pills can actually cause serious harm. Tim Samuels also reveals the marketing secrets used to snare us in - from horny goats to snail trails; and the Mafia-like tactics of the industry which were straight out of the mob copybook. Mel Gibson makes a strange cameo too. For extra content, videos and a regular newsletter go to www.bbc.co.uk/allhailkale
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