How safe is tongkat ali
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2 Hooi-Hoon Ang, Ee-Lin Lee and Hui-Seong Cheang, Determination of Mercury by Cold Vapor Atomic Absorption Spectrophotometer in Tongkat Ali Preparations Obtained in Malaysia, International Journal of Toxicology January 2004 vol. 23 no. 1 65-71
3 H.H. Ang, , K.L. Lee, Contamination of mercury in tongkat Ali hitam herbal preparations, Food and Chemical Toxicology Volume 44, Issue 8, August 2006, Pages 1245-1250
4 Rajeev Bhat, A.A. Karim, Tongkat Ali (Eurycoma longifolia Jack): A review on its ethnobotany and pharmacological importance, Fitoterapia Volume 81, Issue 7, October 2010, Pages 669-679