Three traditional foods for lung-clearing

1. Platycodon root (桔梗 / Doraji)

Platycodon grandiflorus, known in Korean kitchens as doraji, has been used for over a thousand years as a soothing demulcent for the upper airway. Korean medicine views it as a herb that gently "opens" the lungs — clearing phlegm without the irritation of expectorants, and supporting the body's natural mucosal balance.

It is a daily kitchen ingredient, eaten as a side dish in many Korean households, and is one of the cornerstone botanicals in the Pyunkang-Hwan blend. Its role is constitutional: not a treatment for any one symptom, but a continuous gentle support for the airway.

2. Mulberry root bark (桑白皮 / Sangbaekpi)

The bark of Morus alba (white mulberry) is one of the most studied botanicals in Eastern medicine. Its traditional indication is to "cool the lungs" — to relieve the heat-and-irritation pattern Korean medicine associates with chronic cough, post-nasal drip, and seasonal upper-airway distress.

Modern phytochemistry has identified flavonoid and alkaloid compounds responsible for its observed activity, but the Korean medicine view is older and simpler: when the lungs are clean and cool, breathing follows.

3. Houttuynia (魚腥草 / Eosinju)

Houttuynia cordata, the "fishy-smell herb," is a wild Asian green used as both food and medicine across Korea, Japan, and southern China. In Korean medicine it is paired with Platycodon and Mulberry-bark as a clearing herb — supporting the upper-airway mucosa and the skin's barrier function.

It is the only herb in the Pyunkang-Hwan blend with a recognisably herbal aftertaste. Dr. Seo's lectures repeatedly return to Houttuynia as the formula's quiet workhorse.

Why “food,” not “medicine”

Generations of Korean physicians have classified all three botanicals as “food-as-medicine” — items that belong both on the dinner table and in the clinic. This is not a rhetorical compromise; it is a philosophical choice. If your relationship with an organ is meant to last a lifetime, the support should be everyday, edible, and repeatable — not something that appears only when you are sick.

Platycodon as a side dish, mulberry-bark in soup, Houttuynia as tea — at the Korean dinner table, these have been working for a thousand years. Pyunkang-Hwan combines them into a single daily pellet because modern life rarely allows brewing soup three times a week, but the long-view thinking behind them hasn’t changed.

How to bring the three into daily eating

Platycodon: 5–10 g of dried slices, marinated in honey for a week; 1 teaspoon before breakfast, or added to chicken soup or rice.

Mulberry-bark: 10 g simmered with two thumbs of fresh ginger in 1 litre of water for 20 minutes; sip warm in the afternoon, especially in dry autumn weather.

Houttuynia: steep 5 g of dried herb in boiling water for 5 minutes; one cup a day as a daily tea. If the aroma is strong, add mint or lemon.

None of these replace Pyunkang-Hwan; they let the “lung-skin” line have a daily echo in the kitchen.

"Food and medicine, one source" — millennia of East Asian practice

"Food and medicine, one source" (yao shi tong yuan) is a foundational concept in East Asian medical tradition: many everyday ingredients are themselves medicinal, and medicinal ingredients can be everyday food — the difference lies in dosage and combination. The idea traces back to the *Huangdi Neijing* (Yellow Emperor's Inner Canon) and its dietary framework: "five grains for nourishment, five fruits for assistance, five domestic animals for benefit, five vegetables for filling."

**Platycodon** plays two roles at the Korean dinner table — both as a traditional lung-clearing throat-soothing herb (the *Bencao Gangmu* records: "Platycodon, treating cough and ascending qi, broadens the chest and regulates qi"), and as a common namul (banchan side dish made of root strips) and stew ingredient. Spring and autumn are the traditional Platycodon harvest seasons.

**Mulberry bark** comes from the root bark of the mulberry tree (the *Bencao Gangmu*: "Mulberry root bark, drains the lungs, descends qi, moves water, clears heat"); leaves, fruit, branches, root bark — virtually every part of the mulberry has been catalogued for medicinal use across dynasties.

**Houttuynia (yu xing cao, fish-mint)** has a frank name (its smell is fishy), but in Korea, southwest China, and Southeast Asia it has been a salad, soup ingredient, and tea for over a thousand years. The *Bencao Gangmu* records: "Houttuynia, treats phlegm-heat with rapid breathing, lung abscess, sores and toxins."

These three appear among Pyunkang-Hwan's 20+ herbs not because of personal preference, but as a continuation of this millennia-long food-and-medicine lineage.

Modern phytochemistry — active compounds in the three botanicals

Modern phytochemical research on these three botanicals now spans over 60 years:

**Platycodin / saponins:** the principal active compounds in platycodon root, with reported activities in mucus-secretion modulation, anti-inflammation, and immune regulation. Platycodin D in particular has multiple peer-reviewed reports on anti-inflammatory and antioxidant activity.

**Mulberry-bark flavonoids:** mulberry root bark contains multiple flavonoids (Morusin, Kuwanon C, etc.) with reported antioxidant, lipid-regulating, and bronchodilator activity.

**Houttuynia volatile oils and alkaloids:** the characteristic odour of houttuynia comes from decanoyl acetaldehyde, a compound with antimicrobial activity; it also contains multiple flavonoids (quercitrin, isoquercitrin) and alkaloids.

**Important limitation:** most of this research is in vitro or in animal models; human clinical trials remain a smaller body of evidence. We do not say "these compounds can treat X disease" — but their existence demonstrates that traditional botanicals are not "mysticism"; they carry quantifiable, reproducible biological activity.

Korean home seasons and the three botanicals

**Spring (Mar–May):** harvest tender platycodon roots (wild mountain-grown is prized) for namul or soups. Spring platycodon is sweeter, less bitter, and pairs well with pear and honey.

**Summer (Jun–Aug):** harvest fresh houttuynia for cold side dishes; fresh houttuynia juice (yakcho-jeup in Jeju dialect) is a common summer family drink on Jeju Island.

**Autumn (Sep–Nov):** harvest mulberry root bark (peel and dry it), then simmer with ginger, jujube, and honey. In dry autumn, mulberry-bark-and-ginger broth has been a generational family drink on Korean dinner tables.

**Winter (Dec–Feb):** the honey-preserved platycodon prepared in autumn is taken daily in winter, dissolved in warm water. Paired with winter's dry cold air, this has been a North Korean family tradition for over 200 years.

Pyunkang-Hwan compresses this four-season rhythm of multiple botanicals into a single daily standard dose — allowing a modern, busy life to stay connected to this thousand-year food tradition.