"Zelonye Listya" company held production quality control. The company's technologists estimated kefir with fat 3.2% and milk "Otbornoe" with fat 3.2-3.5%. Both products were rated "Excellent".

The company holds examinations systematically. Estimation result depends on the claimed amount of the actual product, the appearance of the bottle, the product color, texture, smell and taste.

Looking back that in May 2014 group of companies "Zelonye Listya" received the HASSP system certificate.