Xinhua reports samples taken Friday in the South Korea’s market by the National Veterinary Research and Quarantine Service has found small concentrations of formalin.

Emergency inspections for formalin at the country’s four major dairy companies have been completed. One of the four dairy companies, Maeil Dairies, collected milk from cows given feed tainted with formalin. Formalin is used in livestock feed, allowing cows to produce a food additive, docosahexaenoic acid, which can benefit brain development in babies and children.

Samples taken from the market had between 0.002 and 0.026 parts per million concentrations of formalin. The amount is considered harmless and within the 0.013-0.057 ppm limit set by the World Health Organization.

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