Pyrrolizidines
Pyrrolizidine alkaloids. There's livertoxic ones, and there's benign ones.
Comfrey again.
Henriette's herbal blog: The myth that comfrey is completely benign just won't die.
Medicinal plants in Europe containing pyrrolizidine alkaloids.
Herbal articles: Pyrrolizidine alkaloids.
Alkaloids.
Henriette's herbal blog: They're cousins of both flavonoids and humanoids.
Coltsfoot toxicity.
Henriette's herbal blog: "Coltsfoot" includes both Tussilago and the various species of Petasites.
Livertoxic PAs.
Henriette's herbal blog: I've avoided plants with livertoxic PAs for years.