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Chinese herbal medicine. Assorted herbs for use in Chinese herbal medicine. Chinese medicine is based on the theory of a universal life force called Qi that is balanced in the body by the complementary forces yin and yang. Disorders are caused by an imbalance of yin and yang. Herbal remedies are prescribed to restore the balance. Photographed in London, UK. (KEYSTONE/SCIENCE PHOTO LIBRARY/ANNABELLA BLUESKY/ACUMEDIC)