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http://dx.doi.org/10.24304/kjcp.2018.28.4.342

Clinical Information on Green Tea Extract Used for Weight Loss  

Youn, Youngjin (College of Pharmacy, Chung-Ang University)
Shin, Sangyoon (College of Pharmacy & Research Institute of Pharmaceutical Sciences, Seoul National University)
Jeong, Kyeong Hye (College of Pharmacy, Chung-Ang University)
Lee, Euni (College of Pharmacy & Research Institute of Pharmaceutical Sciences, Seoul National University)
Publication Information
Korean Journal of Clinical Pharmacy / v.28, no.4, 2018 , pp. 342-346 More about this Journal
Abstract
Background: Green tea extracts are approved as nonprescription drug and available as health functional foods, health foods, and beverages. Clinical information on the products is lacking. Methods: Information about the products on green tea nonprescription drugs was obtained from the website of the Korea Pharmaceutical Information Center. The Naver, i.e., a top ranking online search portal, was used for compiling the list of the health functional food products using key words of 'green tea catechin' on August 23, 2018. The recommended daily dosages of catechins were calculated as 30% of the total dried mass of green tea and about 50% of the catechins were considered as epigallocatechin gallate (EGCG). Results: A total of two types of nonprescription drugs containing green tea powder or extracts, nine health functional food products, and three types of health foods were found. The regulatory requirements of the EGCG exceeding 800 mg were reported to be associated with adverse effects of elevated liver enzyme. If consumers take several green tea products concurrently, such as nonprescription drugs with health functional foods or health foods, it could exceed the recommended amount of EGCG. Conclusion: The concurrent use of green tea products as nonprescription drugs, health functional foods, and healthy foods may lead to an increased exposure to EGCG. Pharmacists should be aware the availability of various types of green tea products and the potential risk of liver toxicity due to excessive consumption of EGCG.
Keywords
Green tea extract; catechin; EGCG; safety;
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