Do you have a source for this? It's a definitive statement that is not true.
It is well known that Ayurvedic medicines do indeed contain toxic heavy metals (put there for reasons of alchemy). See here, for example: Lead, Mercury, and Arsenic in US- and Indian-Manufactured Ayurvedic Medicines Sold via the Internet
Or here: Heavy metal poisoning from Ayurvedic medicines | BC Medical Journal
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