3 September 2012 Last updated at 06:53 ET
China probes 'gutter oil in medicine' claims
Gutter oil is reprocessed kitchen waste dredged from restaurant drains
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Chinese officials have told pharmaceutical firms to check their suppliers after claims that some have used "gutter oil" to make antibiotics, state-run media report.
link-
http://www.bbc.co.uk/news/world-asia-china-19462349