Rumex crispus, or curled dock, has grown along paths and in the damp meadows of Europe since time immemorial. The old herbalists held it in esteem for its bitter root, readily linked to spring cleansing cures, and for its leaves, sometimes cooked as a wild vegetable.
Curled dock root was traditionally used in a spring cure to support digestive and liver function, in the line of bitter cleansing plants.
Root-based preparations were once applied to the skin to soothe certain irritations, as part of traditional skin-cleansing care.
The root, rich in tannins and iron-bearing compounds, was reputed in folk tradition to support vitality during fatigue, particularly in weakened people.
The young leaves, cooked to soften their sharpness, were part of the peasant diet alongside other wild greens of the European countryside.
The root contains oxalates and anthraquinone compounds that can have a marked laxative effect at high doses: prolonged or uncontrolled use is not recommended. Discouraged for pregnant or breastfeeding women, as well as young children, in the absence of sufficient safety data. People prone to calcium-oxalate kidney stones or suffering from kidney problems should avoid the root, which is rich in oxalates. The advice of a doctor or a qualified herbalist is recommended before any internal use, particularly if undergoing medical treatment (possible interactions with certain medications, notably digestive or diuretic ones).
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Wikipedia