超劑量維他命療法 是一種透過攝取超過每日建議攝取量 的維他命 來預防或治療疾病的方式。
超劑量維他命療法在替代醫學 當中相當普遍，也被稱為正分子療法 [ 1] 正分子療法 食物盲從現象 和醫療噱頭
適量的維他命能夠有效預防或治療維他命缺乏所造成的疾病，但超劑量維他命療法是否能夠治療疾病仍然眾說紛紜[ 2] [ 3] [ 4] [ 5] 風濕性疾病 [ 6] 青光眼 [ 7] 思覺失調症 [ 8] [ 9] [ 10] [ 11]
台灣對於成年男性及女性的維生素C推薦膳食攝取量為為100毫克/天[ 12] 参考膳食摄入量 ，成年男性維生素C的推薦膳食攝取量（RDA）為每天90毫克，成年女性為每天75毫克，但不要超過每日2,000毫克[ 13]
萊納斯·鮑林 （Linus Pauling）發表之研究稱靜脈注射維生素 C 可顯著延長晚期癌症患者的壽命[ 14] [ 15]
另外，妙佑医疗国际 （Mayo Clinic）對於癌症患者進行了三項雙盲安慰劑對照隨機試驗，得到維生素C對於癌症患者並無治療效果的結論。該文獻稱經過了33年、且參與的患者達1591人的研究，仍未確定維生素C對於癌症的療效有任何顯著具有臨床意義的抗癌活性。[ 16]
根據一篇關於不同劑量的維生素C與感冒治療的臨床試驗回顧，每天200毫克服用維生素C，並不能降低一般人群的普通感冒發生率，但在兒童中，每日1至2克的維生素 C 可使感冒持續時間縮短 18%，在成人中，每日1至4克的維生素 C 可使感冒持續時間縮短 8%[ 17] [ 18] [ 19] [ 20]
一篇統合分析文章指出額外的維生素C補充能夠顯著降低血中尿酸濃度，這是一種痛風的危險因子[ 21] [ 22]
台灣對於成年男性及女性的維生素E推薦膳食攝取量為12毫克/天(美國為15毫克/天)。[ 12] 美國食品與營養委員會 另根據動物實驗模型顯示高劑量維生素E導致出血，制定可耐受最高攝取量 為1000毫克(1500國際單位)/天。[ 23] [ 24] [ 25] [ 26]
台灣及美國對於成年男性的菸鹼素推薦膳食攝取量為16毫克/天，女性為14毫克/天。菸鹼素在美國可作為處方藥，分為速放劑型(500毫克膠囊，一日最多3000毫克)及延長釋放劑型(500或1000毫克膠囊，一日最多2000毫克)；亦可作為營養補充品使用(500-1000毫克膠囊)。菸鹼素有時會與其他種類降血脂藥合併使用。[ 27] 高密度脂蛋白 濃度。副作用包括提升糖尿病風險等。[ 28] [ 29] [ 30]
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