FoodNavigator.com have reported the findings by Taiwanese Food & Drug administration of copper chlorophyllin in 12 imported oil products in the last month.
The finger is being pointed at European suppliers. 8 of the products were from Italy and 4 were from Spain.
This comes after government agencies raided the offices of Spanish company Vidoria, a supplier of grape seed oil.
It might be beneficial for UK users of olive oil and grape seed oil to increase supplier monitoring and conduct some additional QA checks on intake.