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To investigate the idea, she tested a range of commercial cordials, fresh berry juices and raspberry leaf extract on bacteria, viruses and fungi that can cause gastro. It significantly reduced the growth of E. coli and several Salmonella species, but only if the cordials contained at least 35% raspberry juice. Some swear by taking a shot each morning leading up to the trip, others prefer to mix a little into drinks while traveling. If we're ever to see a study on raspberry cordial in humans, it'll be conducted by whoever is set to make the profit.