BEIJING -- Chinese authorities found 424 batches of substandard food imports in July, the country's top quality supervisor announced on Wednesday.

Poor quality, excessive additives and microbial contamination were the main problems discovered in these imports, which came from 35 countries and regions, according to the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ).

The rejected food products fell under 19 categories, with most classified as biscuits and candies, beverages and seasonings, said AQSIQ spokeswoman Li Jing.

Besides food, the AQSIQ also found four shipments of substandard cosmetic products imported from three countries and regions.

All the substandard products were either sent back or destroyed, Li said.