Safety concerns
There is evidence that using some ayurvedic medicine, especially those involving herbs, metals, minerals, or other materials involves potentially serious risks, including toxicity.
A research study published in the Journal of the American Medical Association found significant levels of toxic heavy metals such as lead, mercury and arsenic in 20% of Ayurvedic preparations that were made in South Asia for sale in America. The Journal found that, if taken according to the manufacturers' instructions, this 20% of remedies "could result in heavy metal intakes above published regulatory standards" Similar studies have been performed in India, and have confirmed these results. Cases of metal toxicity from use of ayurvedic medicines are well known. Some practitioners claimed that "heavy metals are integral to some formulations and have been used for centuries. There is no point of doing trials as they have been used safely and have mention in our ancient texts."
There is a technique of detoxification applied to heavy metals and toxic herbs called samskaras, which is similar to the Chinese pao zhi although the Ayurvedic technique is more complex and may involve prayers as well as physical pharmacy techniques.
The described detoxification is a simple chemical process which involves four successive rounds of boiling the crude root in cow's urine (twice) and cow's milk (twice). This process is claimed to chemically modify both toxic and proposed therapeutic components of the root. It also extracts some of these compounds from the root into the boiling solvents, thereby decreasing their concentration in the final product.
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