Hollyhock (Alcea rosea) is an old cottage-garden mallow with edible flowers and a long tradition of soothing respiratory, digestive and urinary preparations. This guide distinguishes the accepted name Alcea rosea from the older synonym Althaea rosea, reviews its unusually abundant flower mucilage, anthocyanins and flavonoids, summarizes preclinical airway, kidney-stone, glucose, inflammatory and anticancer research, and explains the major evidence gap: convincing controlled human therapeutic trials are still lacking.
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