Peucedanum japonicum

Peucedanum japonicum, known in Japan as “Jin‑chi,” has a long history of use as an expectorant and anti‑inflammatory agent. In the Japanese Kampo pharmacopeia (2005) the dried root is boiled in water to produce a decoction that is taken for cough, bronchitis, and chest congestion; a poultice of the same root is applied externally to reduce swelling and pain. The Korean Pharmacopoeia (2015) records the root as a decoction for cough and as a poultice for skin inflammation, while the Chinese Pharmacopoeia (2020) lists the root as an expectorant in decoction for chronic cough and bronchial irritation. Leaves of the plant are occasionally used in a mild infusion to aid digestion, though the root remains the primary therapeutic part.

A simple, safe preparation is a 1:5 decoction of the root. Take 10 g of dried root, add 200 ml of boiling water, and simmer for 30 minutes. Strain the liquid and drink 2–3 times daily, preferably after meals. Do not exceed 20 g of root per day, and avoid use during pregnancy or lactation because of limited safety data. If you have liver disease or are taking anticoagulants, consult a healthcare professional before use, as coumarin compounds in the plant can affect liver enzymes and blood clotting.

The therapeutic effects of Peucedanum japonicum are largely attributed to its coumarin and furanocoumarin constituents. Analyses of the root reveal high levels of imperatorin, isoimperatorin, and osthole, compounds that have demonstrated bronchodilatory, anti‑inflammatory, and mucolytic activity in laboratory studies. These phytochemicals are believed to underlie the plant’s traditional use as an expectorant and anti‑inflammatory remedy.

Today, extracts of Peucedanum japonicum root are available as herbal supplements in Japan and are the subject of ongoing research into their anti‑inflammatory and respiratory benefits. While the plant remains a staple of traditional Kampo and Korean medicine, modern pharmacological studies continue to validate its historical uses and explore its potential in contemporary respiratory therapy.

Food and beverages (non-medicinal):
* Young leaves and stems are consumed as a leafy green vegetable in Japan and Korea. Preparations include fresh consumption in salads, blanching or stir-frying, or pickling. The flavor is described as mild and herbaceous. No documented processing as beverages (e.g., tea) or fermentation feedstocks.

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