Chinese herbal medicine often uses combinations of different herbs in formulas to achieve synergistic effects. Synergism refers to the phenomenon in which the combination of two or more substances produces an effect that is greater than the sum of their individual parts. This is known as  'Jun Chen Zuo Shi' which means 'the emperor, minister, assistant, and envoy' The herbs work together as a team' 

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The combination of herbs in Chinese medicine is based on the principles of herbal compatibility, which take into account the nature and therapeutic properties of each herb. Different herbs can complement or enhance each other's effects, while some may mitigate any potential side effects of others.

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For example, in a formula for treating a cold, herbs with warming properties such as ginger and cinnamon may be combined with cooling herbs like mint and honeysuckle. This combination can help to regulate the body's temperature, expel pathogens, and relieve symptoms such as fever, cough, and sore throat.

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Another example is the use of a formula called Si Jun Zi Tang (Four Gentlemen Decoction) which is made up of four herbs: ginseng, poria, white atractylodes, and liquorice root. This formula is commonly used to tonify the spleen and improve digestion. Ginseng is considered the emperor herb because it has the strongest therapeutic effect, while the other herbs act as ministers, assistants, and envoys to enhance and support the action of ginseng.

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Chinese herbal medicine is a powerful and safe therapeutic option for multiple health conditions and has withstood the test of time.