Gabriels, G., and P. Smith. “TRACE ELEMENT AND HEAVY METAL ANALYSIS OF COMMERCIAL GINSENG AND HYPOXIS SUPPLEMENT PRODUCTS”. African Journal of Traditional, Complementary and Alternative Medicines 6 (May 3, 2009): 411. Accessed January 30, 2026. https://www.journals.athmsi.org/index.php/ajtcam/article/view/806.