Presence of metals in herbal extracts

Guirguis, Amira, Owen, Jade and Stair, Jacqueline (2012) Presence of metals in herbal extracts. p. 536. ISSN 0031-6873
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Do metals from raw herbs transport into herbal preparations during manufacture? Amira Guirguis and colleagues take a look at the issue using St John’s wort as an example.