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Listener Chris from Suffolk recently took a DNA ancestry test, and after getting some interesting results back, he wondered how accurate they really were?

Greg Foot finds out by taking two tests himself – and has the results and his family tree revealed to him by DNA Genealogist from Finding Families, Louise Baldock.

He also speaks to Professor of Genetics at Leicester University Mark Jobling to find out what these companies are looking for, what they can or can’t determine from our DNA in terms of where we came from, and asks the question – is sharing our DNA with these companies safe?

All of the ideas for our investigations come from you, our listeners, and we’re always on the lookout for more. If you have seen a wonder product that claims to make you happier, healthier or greener, and want to know if it is SB or BS, then please do send it over on email to sliced.bread@bbc.co.uk or drop us a message or voice note on WhatsApp to 07543 306807.

PRESENTER: Greg Foot

PRODUCER: Kate Holdsworth