When you feel a cold coming on, what's the first thing you reach for? For many of us, it's a glass of orange juice or a vitamin C supplement. And for good reason — vitamin C is famous for its immune-supporting powers. But here's the thing: this humble vitamin does so much more than just help you fight off the sniffles.
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that your body needs for a wide range of functions. From helping your skin stay firm to supporting your heart and helping you absorb iron, it's one of those nutrients that quietly works behind the scenes. And because your body can't produce it on its own, you need a steady supply from food.
Vitamin C is an essential nutrient that acts as a powerful antioxidant in your body. It's involved in making collagen — the protein that gives structure to your skin, blood vessels, bones, and tendons. It also helps your body absorb iron from plant-based foods, supports your immune system, and protects your cells from damage caused by free radicals.
Unlike some animals, humans can't make their own vitamin C. That's why it's considered an essential vitamin — we have to get it from what we eat. The good news? It's found in plenty of delicious fruits and vegetables, especially citrus fruits, bell peppers, and leafy greens.
This is vitamin C's claim to fame. It helps your immune cells function properly and supports your body's natural defenses. While it won't magically prevent every cold, having adequate vitamin C may help your immune system respond more effectively and shorten the duration of those pesky symptoms.
Collagen is what keeps your skin looking plump, your joints moving smoothly, and your blood vessels strong. Vitamin C is absolutely essential for making collagen. Without enough, your body can't maintain the "scaffolding" that holds everything together.
Here's a lesser-known superpower: vitamin C significantly boosts your body's ability to absorb iron from plant sources. If you're eating spinach, lentils, or other plant-based iron sources, pairing them with vitamin C-rich foods can make a big difference in how much iron your body actually gets.
Your body faces constant stress from everyday metabolism and environmental factors. Vitamin C helps protect your cells by neutralizing free radicals — unstable molecules that can cause damage over time. Think of it as your body's cleanup crew.
Because of its role in collagen production, vitamin C is essential for wound healing and maintaining healthy skin. It helps your body repair tissues and regenerate skin cells, which is why you'll often see it in skincare products aimed at brightening and evening out skin tone.
Vitamin C is water-soluble, which means your body absorbs it quickly but doesn't store large amounts. Excess is usually excreted in urine — which is why you need a regular intake from food. The good news is that absorption is generally efficient, especially from whole food sources.
One thing to note: vitamin C can be sensitive to heat. Cooking can reduce the vitamin C content of foods, which is why eating some fruits and vegetables raw is a great way to maximise intake. But don't worry — you don't need to eat everything raw. Just including a variety of fresh produce in your diet does the trick.
Getting vitamin C from food is very safe. Since it's water-soluble, your body simply excretes what it doesn't need. However, very high doses from supplements — especially in the form of large single doses — can sometimes cause digestive upset, including stomach cramps, nausea, or diarrhoea.
People with certain conditions, such as kidney stones or iron overload disorders, should be cautious with high-dose vitamin C supplements. As always, food sources are the gentlest and most balanced way to meet your needs. If you're considering a supplement, it's best to talk to a healthcare professional first.
Aim to include a variety of these foods in your diet throughout the week. The more colourful your plate, the better.
Vitamin C may be best known for its immune-boosting reputation, but its roles in collagen production, iron absorption, and antioxidant protection make it a true multitasker. The best part? It's found in some of the most delicious foods around — oranges, strawberries, bell peppers, and more. So next time you're enjoying a colourful salad or snacking on fresh fruit, give a little nod to vitamin C. It's doing more for you than you might think.
Disclaimer: This article is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare professional regarding any health concerns.
感觉快感冒的时候，你第一个想到的是什么？对很多人来说，是橙汁或者维生素C。没错，维生素C以支持免疫力闻名。但其实，这个低调的维生素能做到的事情，比你以为的多得多。
维生素C，也叫抗坏血酸，是一种水溶性维生素，身体需要它来维持多种功能。从帮助皮肤保持紧致，到支持心脏健康、帮助铁的吸收，它总是在幕后默默工作。而且因为身体不能自己制造维生素C，你需要从食物中稳定摄取。
维生素C是一种必需的营养素，也是身体里强大的抗氧化剂。它参与制造胶原蛋白——这种蛋白质给皮肤、血管、骨骼和肌腱提供结构支撑。它还帮助身体吸收植物性食物中的铁，支持免疫系统，并保护细胞免受自由基的伤害。
跟有些动物不一样，人类没办法自己制造维生素C。所以它被称为必需维生素——我们得靠吃来获取。好消息是，很多好吃的水果和蔬菜里都有它，尤其是柑橘类水果、甜椒和绿叶蔬菜。
这是维生素C最广为人知的功能。它帮助免疫细胞正常运作，支持身体的自然防御。虽然它不会神奇地让你不感冒，但维生素C足够时，免疫系统可能反应更有效，那些烦人的症状也可能短一些。
胶原蛋白让皮肤看起来饱满、关节活动顺畅、血管有弹性。而维生素C是制造胶原蛋白必不可少的。没有它，身体就没办法维持那个"撑住一切"的骨架。
这里有个很多人不知道的超能力：维生素C能显著提升身体对植物性铁的吸收率。如果你吃菠菜、扁豆这些植物性铁来源，搭配富含维生素C的食物一起吃，身体能吸收的铁会多很多。
身体每天都要面对新陈代谢和环境带来的压力。维生素C帮助中和自由基——那些可能造成细胞损伤的不稳定分子。你可以把它想成身体的清洁队。
因为参与胶原蛋白制造，维生素C对伤口愈合和维持健康皮肤很重要。它帮助身体修复组织、再生皮肤细胞，这也是为什么很多护肤品里会添加它，用来提亮肤色。
维生素C是水溶性的，身体吸收快，但不会大量储存。多余的部分通常从尿液排出——所以你需要从食物中稳定摄取。好消息是，从天然食物中吸收通常很有效率。
有一点要注意：维生素C对热敏感。烹饪可能会减少食物里的维生素C含量，所以生吃一些水果和蔬菜是很好的方式。但也不用太担心——只要饮食中有多样化的新鲜蔬果就够了。
从食物中摄取维生素C非常安全。因为是水溶性，身体会把不需要的排出去。但高剂量补充剂——尤其是单次剂量太大——有时可能引起肠胃不适，比如胃痛、恶心或腹泻。
有某些状况的人（比如肾结石或铁过载问题）要谨慎使用高剂量维生素C补充剂。老话一句：从食物摄取最温和，也最平衡。如果考虑补充剂，最好先跟专业人士聊聊。
把这些食物轮着吃进日常饮食里，就能轻松满足维生素C的需求。盘子越多彩，通常越好。
维生素C可能以免疫支持闻名，但它在胶原蛋白制造、铁吸收、抗氧化方面的作用，让它成为名副其实的多面手。最好的部分是，它存在于很多好吃的食物里——橙子、草莓、甜椒，还有更多。下次吃色彩缤纷的沙拉或新鲜水果时，可以默默感谢一下维生素C。它在为你做的事情，比你以为的还要多。
免责声明：本文仅供教育用途，不构成医疗建议。如有健康问题，请咨询合格的医疗专业人员。