Together with acupuncture, Chinese herbal medicine is major pillar of Chinese Medicine. In the Chinese pharmacopoeia, there are over 6000 different medicinal herbs. There are around 600 common used herbs used in TCM today. Herbs are categorized by their energy characteristics. These catorgories are hot, warm, cold, neutral and aromatic. The other category the herbs get grouped by is by taste such as sour, bitter, sweet, spicy and salty. The various combinations of the herbs gives properties to influence the yin and yang of the body.