Hai Zao Yu Hu Tang — Sargassum Decoction for the Jade Flask

On this page

1. Overview
2. TCM pattern
3. Key herbs
4. Formula actions
5. Conditions treated
6. Cautions

Overview

Hai Zao Yu Hu Tang — the “Sargassum Decoction for the Jade Flask” (referring to the neck) — is from Chen Shigong’s Ming-dynasty Wai Ke Zheng Zong (Orthodox Lineage of External Medicine). It is the classical TCM formula for goitre and benign neck swellings — in TCM the neck is the area where Liver-Qi stagnation, Phlegm and Blood-stasis combine to form palpable swellings. The seaweed pair (Hai Zao, Kun Bu) provides iodine and softens hardness; Phlegm-resolving herbs (Ban Xia, Bei Mu, Chen Pi) break up Phlegm accumulation; Blood-movers (Dang Gui, Chuan Xiong) address stasis; Lian Qiao resolves Heat-toxin.

I prescribe Hai Zao Yu Hu Tang as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan.

TCM pattern

Hai Zao Yu Hu Tang is prescribed for Liver Qi stagnation with Phlegm accumulation in the neck:

• Diffuse or nodular swelling at the front of the neck (thyroid region)
• Sensation of fullness or obstruction in the throat
• Possibly mild dysphagia or hoarseness
• Stress-related worsening
• Possibly chest oppression or sighing
• Tongue — possibly thick greasy coat
• Pulse — wiry, slippery

Key herbs

1. Hai Zao (sargassum, 15g), Kun Bu (laminaria, 9-15g), Hai Dai (seaweed) — soften hardness; iodine-rich; reduce goitre
2. Ban Xia (Rz. Pinelliae Preparatum, 3-14g), Bei Mu (Hb. Fritillariae Thunbergii, 9-15g), Chen Pi (Per. Citri Reticulatae, 3-9g) — transform Phlegm
3. Qing Pi — moves Liver Qi; disperses nodules
4. Dang Gui (Rx. Angelicae Sinensis, 12-30g), Chuan Xiong (Rx. Chuanxiong, 12-18g) — move Blood
5. Lian Qiao (Fr. Forsythiae, 6-12g) — clears Heat; resolves toxin; dissipates nodules
6. Du Huo (Rx. Angelicae Pubescentis, 6-9g) — expels Wind-Damp (in some versions)
7. Gan Cao (Rx. Glycyrrhizae, 3-6g) — harmonises (note: classical formula uses Gan Cao with Hai Zao, traditionally considered antagonistic — modern use either omits Gan Cao or uses small amounts)

Formula actions

1. Softens hardness; dissolves nodules
2. Transforms Phlegm
3. Moves Liver Qi and Blood
4. Clears mild Heat

Conditions treated

1. Benign goitre, simple or multinodular (alongside endocrine assessment)
2. Benign thyroid nodules
3. Hashimoto’s thyroiditis with thyroid enlargement (adjunctive, with conventional care)
4. Subacute thyroiditis recovery phase
5. Cervical lymphadenopathy from chronic Phlegm
6. Branchial cyst (not surgical case)
7. Thyroglossal duct cyst (not surgical case)

Cautions

Contains iodine-rich seaweeds — not appropriate in hyperthyroidism unless used carefully under monitoring; check TSH and antibodies before prescribing. Caution in patients with iodine-induced thyroid dysfunction.

Any thyroid nodule needs proper endocrine evaluation (TSH, ultrasound, possibly FNA) to exclude malignancy — herbs are adjunctive only.

Hai Zao and Gan Cao are listed as classical Eighteen Incompatibilities (shi ba fan); modern practice cautions against combining or uses minimal Gan Cao.

Pregnancy: not recommended due to iodine load and the moving herbs.

Always consult a qualified Chinese herbalist registered with the RCHM.

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