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Herbal medicines are categorized into three safety groups: the first includes highly toxic herbs like Atropa belladonna, Aconitum, Arnica, and Digitalis that require expert supervision; the second includes herbs with strong physiological effects like Lobelia and Euonymus that are generally safe when used correctly; and the third includes herbs like Comfrey, Yohimbe, and Mistletoe that have known toxicities, particularly hepatotoxic effects, and are not recommended for internal use by non-professionals.

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