Cang Er Zi San - 苍耳子散 - Xanthium Formula (Capsules)

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Full-spectrum, water-based herbal extract; concentrated 5:1 capsules (100caps./bottle).

Item Number: C005-c
Chinese Name:
苍耳子散, Cang Er Zi San Capsules
English Name: Xanthium Formula
Formula Principles: Disperses Wind, Alleviates and relieves nasal pain, Frees nasal passages*
Potency: Full-spectrum, water-based herbal extract; concentrated 5:1 granules.
Available in: Granules (100g/bottle) and Capsules (100caps./bottle)

What is Cang Er Zi San?

Cang Er Zi San, also known as Xanthium Formula, is a classical formula best known for its ability to clear the nasal passages.

What are the benefits of Cang Er Zi San?

Cang Er Zi San is traditionally used in Chinese medicine to disperse Wind, alleviate and relieve nasal pain, and free the nasal passages.

Those suffering from a TCM pattern known as Wind-Heat Attack may benefit from this formula. This pattern includes profuse nasal discharge, frontal headache, dizziness and nasal pain and obstruction. 

What is the dosage and method for taking Cang Er Zi San?

The generally recommended dosage of Cang Er Zi San in capsule form is four capsules, two to three times daily; or as loose granules, 4.5 g mixed with hot water, 2-3 times per day. However, always follow your healthcare provider's instructions, as the dosage can vary based on your condition and response to treatment.

Please see What's the Recommended Dosage for Granule Herbs? for more information.

When can I expect to see results?

Cang Er Zi San typically starts to take effect within days. However, like all treatments, its efficacy can vary from person to person.

Does Cang Er Zi San have any side effects?

While Cang Er Zi San is generally considered safe for most people, it can cause side effects in some individuals. Women who are pregnant, nursing, or postpartum as well as people with liver disease, should avoid or use Cang Er Zi San with caution.

As with any Chinese herb, we recommend consulting with a qualified practitioner of traditional Chinese medicine (TCM) about Cang Er Zi San before any course of treatment is started. 

Where to buy Cang Er Zi San

For practitioners, Treasure of the East offers full-spectrum Cang Er Zi San capsules (100 caps./bottle) granules (100g/bottle).

If you’re a consumer looking to purchase Cang Er Zi San, look for suppliers who provide clear information about the product's origin, purity, and testing procedures to ensure you're getting a high-quality product. Please read Where to Buy Chinese Herbs Safely for more tips on how to source herbs safely.

Cang Er Zi San from Treasure of the East is:
✔️ ISO Lab Tested & GMP Certified
✔️ Bio-Authentic with Full Traceability
✔️ Sustainably Sourced from Dao Di Farms


Cang Er Zi (Chao) Xanthium Fruit (Processed)
Bai Zhi Dahurian Angelica Root
Xin Yi Magnolia Flower
Bo He Mint Herb


Treasure of the East’s herbal extracts are full-spectrum, water-based extracts produced by Tianjiang Pharmaceutical. Unlike standardized extracts, which contain a concentrated quantity of a single marker chemical, full-spectrum herbal extracts contain all the active chemical constituents of whole herbs in concentrated form.  Treasure of the East herbs are full-spectrum and extracted using only purified water (more information).

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