J Toxicol Environ Health A. 2007 Oct;70(19):1694-9.

Public health risks from heavy metals and metalloids present in traditional Chinese medicines.

Cooper K, Noller B, Connell D, Yu J, Sadler R, Olszowy H, Golding G, Tinggi U, Moore MR, Myers S.

Source

National Research Centre for Environmental Toxicology, University of Queensland, Coopers Plains, Queensland, Australia.

Abstract

Out of 247 traditional Chinese medicines (TCM) investigated, a proportion were contaminated with arsenic (5-15%), lead (approximately 5%), and mercury (approximately 65%). Some preparations exceeded the tolerable daily intake (TDI) for males and females for arsenic (4 and 5 products, respectively), lead (1 and 2 products), and mercury (5 and 7 products). These exceedances were as high as 2760-fold, which posed a potential danger to public health. As many users are known to self-prescribe, there is a substantial risk of poisoning from the consumption of these contaminated TCM.

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