Mustard Seed
芥子 · Jiè Zǐ
Warms cold lungs and stiff joint pain
Properties
WarmingWarming botanicalPungent
Concerns
What it does
Mustard seed warms the lungs to relieve cold-pattern coughs with thin, watery mucus, and applies topically for stiff cold-pattern joint pain. In TCM, it transforms cold-phlegm and unblocks collaterals. The classical use as a chest plaster for chronic bronchitis is still common. One systematic review covers chest-applied mustard plasters.
How to take it
Decoct 3–9g of crushed mustard seed in water for 25 minutes. Drink 1 cup during cold-pattern cough. For topical use, mix powder with water as a chest plaster, max 15 minutes.
Try a chest mustard plaster for cold-pattern bronchial congestion (15-min max)
Toast whole seeds and crush for spice rubs. Use in pickles, curries, and dressings.
Toast mustard seeds in oil until they pop, then drizzle over roasted vegetables
Safety
- Topical mustard paste can blister sensitive skin. Test small area first
- Skip during pregnancy in medicinal doses
- Strong-acting on lung. Avoid in hot patterns or yin-deficient cough
- May affect blood pressure. Monitor if you take antihypertensives
- Talk to your doctor before starting medicinal use, especially if you take medication
Where it comes from
Mustard (Brassica juncea) is one of the world's oldest cultivated crops, used for both food and medicine across Asia and Europe. The seeds (Jiè Zǐ) and leaves are used differently in TCM: the seeds are warming and lung-focused, the leaves are food. Classical Chinese medicine uses ground mustard seed in a chest plaster (San Zi Yang Qin Tang style) for chronic bronchitis. Modern research has studied mustard's isothiocyanates for cardiovascular markers.