The function of Vitamin C

維生素C又稱L-抗壞血酸，是高等靈長類動物與其他少數生物的必需營養素。抗壞血酸在大多的生物體可藉由新陳代謝製造出來，但是人類是最顯著的例外。最廣為人知的是缺乏維生素C會造成壞血病。[1][2][3]

維生素C的藥效基團是抗壞血酸離子。在生物體內，維生素C是一種抗氧化劑，因為它能夠保護身體免於氧化劑的威脅[4]，維生素C同時也是一種輔酶[5]。

對人體功能
在人體內，維生素C是高效抗氧化劑，用來減輕抗壞血酸過氧化物酶(ascorbate peroxidase)基底的氧化應力(oxidative stress)。[3]還有許多重要的生物合成過程中也需要維生素C參與作用。
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Vitamin C or L-ascorbate is an essential nutrient for higher primates, and a small number of other species. The presence of ascorbate is required for a range of essential metabolic reactions in all animals and in plants and is made internally by almost all organisms, humans being one notable exception. It is widely known as the vitamin whose deficiency causes scurvy in humans.[1][2][3] It is also widely used as a food additive.

Function
In humans, vitamin C is a highly effective antioxidant, acting to lessen oxidative stress, a substrate for ascorbate peroxidase,[3] as well as an enzyme cofactor for the biosynthesis of many important biochemicals. Vitamin C acts as an electron donor for eight different enzymes:[7

維他命C的主要功用是預防壞血病及幫助傷口癒合

It can prevent the sickness of scorbutus and help the wound healed over.