Tea is a product which contains of natural antioxidants for relaxation, prevention and healing effects, biofl avonoids, isofl avonoids, organic acids, glycoside and other substances. In order to use this valuable natural commodity economically with keeping the ecologicalbalance and provide quality and safety, nowadays, fi ltered tea bags become popularfor producing. The international standards forinfusion substance portion, antioxidants content, and quality and safety specifi cations for this type of tea are the important measures for preventing of fake products. The sustainable quality study is one of the main parameters, indicating the drug quality, safety and effects. The validity and storageconditions of the drug and its active agents are determined by the study.Aim: To determine the validity /expirationperiod/ of liver protection effect “Tunamal” tea by studying the parameters of its sustainable qualityObjective: To defi ne the expiration time by analyzing annually the moisture, ash, infusion substance, essential oil, appearanceof dry substances, ascorbic acid, content ofthe fl avonoids, mixture of heavy metals and microbiological parametersMaterials and methodologyCommodity of the study, which are the creeping thyme and rosehips fruits, were collected from the territory of Erdene county of Central province and Eruu county of Selenge province respectively; and dried in accordance with the standards. The moisture, ash, infusion substance, essential oil, appearance of dry substance, ascorbic acid, content of all fl avonoids wereanalyzed by methods set by Mongolian national pharmacopoeia, radioactive contamination and presence of heavy metals – by atomic absorption spectrometric method, afl atoxin B1 and pesticide residues – by thin-layer chromatography respectively,; and microbial contamination was analyses in the Steward geological laboratory in the culture medium as well as in the drug inspection laboratory of the State professional inspection authority.