Rice noodle samples taken randomly from producers and traders tested positive for banned substances in some provinces in the Mekong Delta.
Dong Thap Province was leading with 19 out of 20 samples testing positive for Tinopal content, followed by Hau Giang with four samples, Can Tho with one and Kien Giang having rice noodles with both Tinopal and Oxalic acid.
The Department of Health in the Mekong Delta City of Can Tho is now providing training in food safety and hygiene to food managers.
Tran Quang Trung, Head of Vietnam Food Administration, said they need to publicize and update food regulations to managers, producers, traders and consumers.
Tinopal intake can damage the liver, kidney and neurological system, and increase risk of cancer.