China's top quality watchdog said Wednesday that 19 oolong tea products, including Lipton Tieguanyin, were found below regulatory standards in its latest check on oolong tea quality.

The check targeted 58 oolong tea products from seven provinces and regions, including Beijing, Shanghai, and the provinces of Jiangsu, Zhejiang, Anhui, Fujian and Guangdong, according to the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ).

None of the inspected products were found to contain excessive contents that were considered harmful to health, but the checks found problems with a Tieguanyin variety of oolong produced for the Unilever-owned Lipton brand. It failed to meet regulatory standards in terms of rare content.

Another Tieguanyin product, Zhengxiangyuan Anxi Tieguanyin, was found substandard in terms of rare content and sensory quality, according to the AQSIQ.

In another check targeting 114 milk powder products, four producers, including Shaanxi Jin Niu Milk Co., Nongken Xuehua Milk Co., Baiyue Milk Co. and Dingbian Diary Co. were ordered to improve their product quality, but none of them were found to include excessive ingredients that risk health.