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患者女性，39歲，形體肥胖，自訴感冒1+月，曾服中西藥不效，症見神疲乏力，項背強，微惡寒，加衣側惡熱，自汗出，心悸怔忡，胸及脘悶痞脹，口渴。其脈沉細，右寸略浮，舌淡紅苔薄白中剝，證屬素體陽虛，外感風寒，表寒未盡，心陰心陽受損，胃津不足。方用桂枝湯 6g，四逆湯 6g，葛根1g ，日三服。患者藥後即時自覺胃中有一股熱感由內而外擴散，達至表皮後即微微汗出，胸悶脘痞立時大減，並覺頭目清爽⋯⋯

Interest in a potential role for vitamin D in the prevention or treatment of acute respiratory infections dates back to the 1930s, when cod liver oil was investigated as a means to reduce industrial absenteeism due to the common cold. Meta-analyses of randomised controlled trials conducted from 2007–20 reveal protective effects of vitamin D against acute respiratory infections, albeit these effects were of modest size and with substantial heterogeneity.1 The striking overlap between risk factors for severe COVID-19 and vitamin D deficiency, including obesity, older age, and Black or Asian ethnic origin, has led some researchers to hypothesise that vitamin D supplementation could hold promise as a preventive or therapeutic agent for COVID-19…