The results, published in the journal Forensic Science, Medicine and Pathology, showed all formulations demonstrated significant levels of toxicity.
The authors cautioned that people with underlying liver disease or who are taking prescription medications should be warned of this potential side effect.
They added: “All such preparations should include accurate labelling of the ingredients until further studies can be undertaken to identify the specific herbal substances that are toxic.
“If unexpected liver damage is encouraged at autopsy, information on possible recent infection of herbal food preparations should be sought, as routine toxicology screening will not identify the active components.”
source: express.co.uk