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The Purity and Concentration of our Lei Gong Teng is 50:1 of root extract of Lei Gong Teng (Radix Tripterygii Wilfordii). That’s is 50 times more concentrated than the use of the raw plant. There are many versions of Lei Gong Teng. The whole, unprocessed plant is not recommended for human consumption. The use of the whole plant is toxic, among the side effects being problems and intestinal irritation, suppression of lymphocyte proliferation to cardiac arrest in rare cases. Our product contains only the active substance called tryptolides and all other harmfull components are removed.