Just pulled this from an article mentioned in Toning and Sealing Thread.
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Finish 4: Nothing
The FDA (US Food and Drug Administration) suggests you use nothing. Raw wood provides one of the best food preparation surfaces known to man.
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Funny..... I've been going on about this for years. Good to see a government department somewhere using their brains and not forcing people into using those disgustingly unhealthy plastic things like they tried to do here.