Raw Herbs vs Concentrated Granules

The question

People who see a Chinese herbal practitioner are sometimes offered either raw herb pieces, which are traditionally boiled into a decoction, or concentrated granules. Many ask which is better. This page compares them using the research we could read. It does not tell you which to choose and gives no preparation instructions. For all product types, see Decoctions, Granules, Teapills, Tinctures and Patches.

What each one is

Granules are made from a single Chinese herbal drug by extraction with hot water, separation, concentration, drying and granulation, and they are used in the clinic under TCM theory. [1] Raw herbs are the plant pieces themselves, usually cooked by the person or pharmacy into a decoction.

What the trials found

The main systematic review compared the two forms.

1. Is effectiveness different?

   Promising but limited

   In 56 clinical trials (42 randomized; 14 other controlled), 98.2% (55 of 56) found no significant statistical difference between granules and decoctions. [2]

2. How good were the trials?

   Low quality

   All trials were done in China and published in Chinese. [2] The randomized trials were generally of low methodological quality: 7 reported adequate randomization. [2]

3. Safety?

   Insufficient evidence

   No severe adverse effects were reported in either group, but the authors could not reach a definitive conclusion about equal safety. [2]

Chinese-language trial literature has known quality problems, and many of these trials were not blinded, so expectation effects are possible. The review authors concluded the evidence supports continued use of granules in practice and research, and that standardization of granules and more rigorous studies are needed. [2]

Do all granules match each other?

Not necessarily. In one laboratory study, nine Ge-Gen decoction granule products from different manufacturers were compared. They differed in their ability to reduce inflammatory markers in cells. [3] The authors describe granules as entering the market on a large scale while little attention had been paid to quality control of the dosage form. [3] That was a study of one formula, in cells and mice, not people, so it is preclinical. It shows why brand and source matter.

Bottom line

There is no good evidence that one form works better or is safer. Proper evidence not found from high-quality, blinded trials of granules versus raw decoction in Western settings. Your choice is better made with a qualified practitioner and your pharmacist.