THERAPIES & TRADITIONS · GUIDE
Decoctions, Granules, Teapills, Tinctures and Patches: Forms of Chinese Herbal Products
The main forms of Chinese herbal products, from decoctions and granules to pills, tinctures and plasters, with what is known about quality differences and hidden-drug risks.
Content last updated . This page has not been medically reviewed.
Back to Traditional Chinese MedicineWhy the form matters
The same herb can be sold in very different forms, and each form has its own quality questions. This page explains the forms and what research says about them. It gives no preparation or self-treatment instructions. A form is not a mark of safety: a product that looks traditional can still be contaminated or mislabeled. Start with Chinese Herbal Medicine for the big picture.Forms described in the literature
One review lists classic dosage forms of traditional Chinese herbal products: decoction, pill, powder, concentrated decoction, ointment, plaster, syrup, wine, suppository and tincture. [1] Modern science and technology have added tablets, capsules, granules, dripping pills and inhalants. [1]| Form | In plain terms | Quality points to know |
|---|---|---|
| Decoction | A water-based preparation of herb pieces made by a practitioner or pharmacy. | Depends on which herbs and processing were used; see Raw Herbs vs Concentrated Granules. |
| Granules | Made from single herbs by extraction with hot water, separation, concentration, drying and granulation. [1] | Studies show products from different manufacturers differ. [2] |
| Pills (including "teapills") | Ready-made pills, often sold as patent medicines. | The Chinese Pharmacopoeia records preparation methods for patent medicines. [3] |
| Tinctures and wines | Liquid extracts. | Listed as classic forms. [1] Proper evidence on their comparative quality not found. |
| Plasters, ointments, patches | Applied to the skin. | Listed as classic forms. [1] See Chinese Herbal Liniments, Plasters, Baths and Foot Soaks. |
"Teapill" is a retail term. We found no source that defines it formally, so ask a pharmacist what a specific product contains and how it is made.
Processing and standards
Many Chinese herbal drugs are processed before clinical use, by methods such as cutting, crushing, steaming, calcining and stir-frying with or without liquid or solid excipients. [1] In China, the pharmacopoeia sets the legal basis for drug production and quality. [3] See The Chinese Pharmacopoeia and Quality Standards.Granules versus decoctions: what is known
A systematic review of 56 clinical trials (42 randomized, 9,748 people) found 98.2% of studies reported no significant difference in effectiveness between granules and decoctions. [4] But all trials were in China, and most were of low methodological quality. [4] The authors said a definitive conclusion could not be reached. [4] Evidence strength: promising but limited, and not enough to treat the forms as equivalent. The full comparison is on the raw herbs vs granules page.Frequently asked questions
What is the difference between a decoction and granules?
A decoction is a water-based preparation of herbs. Granules are made by extraction with hot water, concentration, drying and granulation. [1]
Are granules as effective as decoctions?
In a systematic review of mainly low-quality Chinese trials, 55 of 56 found no significant difference, but the authors could not reach a definitive conclusion. [4]
Are patent medicines regulated?
It depends on the country. In China the pharmacopoeia sets standards for them. [3] In the EU, rules for TCM granules differ between countries. [1]
Can a ready-made Chinese product contain hidden drugs?
Yes, some have. Studies found undeclared pharmaceuticals in samples in New York City and Hong Kong. [6][7]
Are topical plasters safer than pills?
Proper evidence not found in the sources we read comparing safety by form.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Product quality and safety
Quality problems do not belong to one form. NCCIH notes that some Chinese herbal products have been contaminated with toxic compounds, heavy metals, pesticides and microorganisms. [5] Studies of finished products have found undeclared drugs:
- Of 90 Chinese herbal and patent medicine samples bought in a New York City neighborhood, five contained nine different Western pharmaceuticals, in pills, tablets, creams and teas. [6]
- In Hong Kong, 29 adulterated herbal antidiabetic products were linked to 27 patients, and hypoglycaemia was the most common adverse effect. [7]
These are sample studies, not a measure of how common the problem is across the market. They show why buying from unverified sources is a real risk. For general buying advice see Buying Chinese Herbs Safely.
Regulation depends on where you live
In most EU member states, TCM granules are regarded as food supplements, but in Germany they are considered medicine. [1] In the US, supplement rules are different again; see How Supplements Are Regulated. Check the rules in your own country and ask a pharmacist about any product.
Who should check first
Pregnant or nursing people, children, people who take prescribed medicine (especially blood thinners or diabetes medicine), and anyone with kidney or liver disease should talk to a clinician or pharmacist first. NCCIH advises extra care with pregnancy, nursing and children. [5] Do not stop any prescribed medicine because of an herbal product. If you feel unwell after taking one, stop it and seek medical care; US Poison Help is 1-800-222-1222.
References
- Wang M, et al. Key quality factors for Chinese herbal medicines entering the EU market. Chin Med 2022. Read 2026-10-22.
- Comprehensive comparison of the anti-inflammatory activity and chemical consistency of traditional Chinese medicine formula granules from different manufacturers. Biomed Chromatogr 2019. Read 2026-10-22.
- Yin XB, et al. Preparation regularity of Chinese patent medicine in Chinese Pharmacopoeia (2020 edition, Vol. I). Zhongguo Zhong Yao Za Zhi 2022. Read 2026-10-22.
- Luo H, et al. Comparison of effectiveness and safety between granules and decoction of Chinese herbal medicine: a systematic review of randomized clinical trials. J Ethnopharmacol 2012. Read 2026-10-22.
- National Center for Complementary and Integrative Health. Traditional Chinese Medicine: What You Need To Know. Read 2026-10-22.
- Miller GM, Stripp R. A study of western pharmaceuticals contained within samples of Chinese herbal/patent medicines collected from New York City's Chinatown. Leg Med (Tokyo) 2007. Read 2026-10-22.
- Ching CK, et al. Adulteration of herbal antidiabetic products with undeclared pharmaceuticals: a case series in Hong Kong. Br J Clin Pharmacol 2012. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.