Safety
Rasa shastra, the practice of adding metals, minerals or gems to herbs, may have toxic heavy metals such as lead, mercury and arsenic. Adverse reactions to herbs due to their pharmacology are described in traditional ayurvedic texts, but ayurvedic practitioners are reluctant to admit that herbs could be toxic and that reliable information on herbal toxicity is not readily available. And there is communication gap between modern medicine practitioners and Ayurvedic practitioners
According to a 1990 study on ayurvedic medicines in India, 41 percent of the products tested contained arsenic, and 64 percent contained lead and mercury. A 2004 study found toxic levels of heavy metals in 20 percent of ayurvedic preparations made in South Asia and sold in the Boston area, and concluded that ayurvedic products posed serious health risks and should be tested for heavy-metal contamination. A 2008 study of more than 230 products found that approximately 20 percent of remedies (and 40 percent of rasa shastra medicines) purchased over the Internet from both US and Indian suppliers contained lead, mercury or arsenic. In 2012 the U.S. Centers for Disease Control and Prevention (CDC) stated that Ayurvedic drugs have been linked to lead poisoning on the basis of some cases where pregnant women had taken Ayurvedic drugs and toxic materials were found in their blood.
Ayurvedic proponents believe that the toxicity of these materials is reduced through purification processes such as samskaras or shodhanas (for metals), similar to the Chinese pao zhi, although the ayurvedic technique is more complex and may involve prayers as well as physical pharmacy techniques. However, these products have nonetheless caused severe lead poisoning and other toxic effects.
Due to these concerns, the Government of India ruled that ayurvedic products must specify their metallic content directly on the labels of the product, but, writing on the subject for Current Science, a publication of the Indian Academy of Sciences, M. S. Valiathan noted that "the absence of post-market surveillance and the paucity of test laboratory facilities make the quality control of Ayurvedic medicines exceedingly difficult at this time.
Read more about this topic: List Of Ancient Indian Doctors
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