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Two New Zealand schoolgirls humbled one of the world’s biggest food and drugs companies after their school science experiment found that their ready-to-drink Ribena contained almost no trace of vitamin C.

Students Anna Devathasan and Jenny Suo tested the blackcurrant cordial against rival brands to test their hypothesis that cheaper brands were less healthy.

Instead, their tests found that the Ribena contained a tiny amount of vitamin C, while another brand’s orange juice drink contained almost four times more.

“We thought we were doing it wrong. We thought we must have made a mistake,” Anna told New Zealand’s Weekend Herald.

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GSK is in court in Auckland today facing 15 charges relating to misleading advertising, risking fines of up to NZ$3m (£1.1m).