As of April 2012, there are no reliable-quality lei gong teng supplements being manufactured in the United States, and the safety of foreign products cannot be verified, according to the National Center for Complementary and Integrative Health. Lei gong teng, or thunder god vine, is used in traditional Chinese medicine.
Lei gong teng must be harvested carefully from the skinned root of the vine because all other parts of the plant are poisonous. NCCIH reports that even when properly extracted, supplements containing the herb can cause gastrointestinal and respiratory side effects. Practitioners of traditional Chinese medicine use lei gong teng to treat inflammation and autoimmune diseases; in recent studies, it has shown promise as a treatment for rheumatoid arthritis.