28 March, 2007 - Published 12:52 GMT

Ribena Rumbled

Ribena's been a popular fruit drink since the second world war, one of its selling points has always been that its blackcurrent content makes it a good source of vitamin C.

But thanks to a school science project carried out by two fourteen year old school girls, the company that makes Ribena is having to revise its claims of nutritional benefits.

Glaxo SmithKline was in court today in New Zealand where it pleaded guilty to misleading advertising. It admitted fifteen charges in a case brought by New Zealand's commerce commission but based on evidence supplied by the two school children.

Anna Devathasan and Jenni Suo are now seventeen, they're still at school from where they told me all about the case - Anna first, on what they did with their findings.

Anna and Jenni on how they nailed Glaxo.

GlaxoSmithKline has put out a statement on accepting the charges against it, they say they've already revised all advertising that could be potentially misleading, they've modified Ribena labels on the Ready to Drink products and implemented a plan to reformulate Ready to Drink Ribena with new methods for testing Vitamin C.

You can read the full statement at www.ribena.co.nz

First broadcast 27th March 2007