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在新冠疫情大流行期间,每日服用维生素 C 补充剂,仿佛已形成了习惯。因为它有助于增强我们的免疫系统,降低感染疫情的风险。

但是,服用越高剂量的维生素C,会越好吗?

照片来源

虽然维生素是重要营养素之一,但过量服用(上限为 2000 毫克)可能会导致不良副作用。

 

服用维生素 C 最常见的副作用

1. 消化不良

如果摄入超过 2000 毫克的维生素 C,可能会出现腹泻和恶心等症状。然而,这取决于个人身体因素,有些人可能会在服用 1000 毫克后出现腹泻。

照片来源

2. 肾结石

多余的维生素 C 会以草酸盐的形式排出体外。草酸盐是一种身体不必要的物质,会通过尿液排出体外。然而,当草酸盐水平过高时,它有可能与钙等矿物质结合,从而形成肾结石。

照片来源

3. 过高的血铁指数 (又名血色素沉着症) 

由于体内过量的铁会产生过多的活性氧 (ROS),因此对胰腺、肝脏、心脏、甲状腺和中枢神经系统将造成严重的损害。众所周知,维生素 C 可以增强铁的吸收,也因此会增加铁指数过高的风险,尤其是当你有在服用铁补充剂或当你的体内有增加铁积累的风险。

那么要多少的维生素C称之为足够呢?

一般来说,一天里,成年男性的推荐量为 90 毫克,而成年女性的推荐量为 75 毫克。点击这里获取更多讯息

可是,正常量的维生素C补充剂是 500 毫克,那么多余的“毫克”去了哪里呢?

如上所述,多余的维生素 C 将通过尿液排出体外。维生素C是一种水溶性维生素,这意味着它可以溶化于水。它不会被人体吸收,而是通过体液输送到身体组织中。 (是的,多余的都将都排出体外)

 

总的来说,我们只需摄取足够的维生素 C,因为多并不一定是好事!

Tags :

  • vitC |
  • vitaminC

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Written By

Ms. Elaine Fung

Reviewed By

Doc2us Medical Board

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