Are there adulterants in imported herbal preparations?
Yes. One must be extremely careful when selecting pre-formulated packaged herbs, often known as `patent formulas ‘ (zhong cheng yao, in Chinese). Some such herbal preparations contain heavy metals (such as mercury, known as cinnabar in herbal terms, lead, and others). Still others may contain prescription medicines that are not listed on the label. One must proceed with knowledge and care.
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