Vitamin C is one of those nutrients everyone has heard of but few people can say much about. It helps your body make collagen, supports normal immune function, helps wound healing, and boosts the absorption of iron from plant foods.
Unlike most animals, humans cannot make vitamin C, so we need to get it from food every day. This guide covers how much you need, 10 excellent food sources, and simple ways to eat more of them.
Contents
- How much vitamin C do you need?
- 10 foods rich in vitamin C
- How to keep vitamin C in your food
- Vitamin C, colds and supplements
- Who should be careful
- FAQs
How Much Vitamin C Do You Need?
Recommendations differ between countries.
| Group | US RDA | UK guidance |
|---|---|---|
| Adult men | 90 mg a day | 40 mg a day |
| Adult women | 75 mg a day | 40 mg a day |
| Smokers | Add 35 mg a day | Not specified separately |
The gap is largely due to different approaches to setting reference values. In both countries, most people who eat a varied diet with fruit and vegetables reach their needs. Smoking increases the body’s vitamin C requirements, so people who smoke may need more.
Severe deficiency causes scurvy, which is rare in developed countries but can occur with very limited diets, alcohol dependence or certain medical conditions. Early signs include fatigue, bleeding gums and slow wound healing.
10 Foods Rich in Vitamin C
The amounts below are approximate and come from standard US reference values. Exact content varies with variety, ripeness and storage, so use them as a guide. You can check specific figures in the USDA FoodData Central database or the NIH Office of Dietary Supplements fact sheet.
1. Red and yellow peppers
Sweet peppers are among the richest everyday sources. Half a cup of chopped raw red pepper provides roughly 95 mg, which is more than the daily amount for many adults. Slice them into salads, dip strips in hummus, or roast them with other vegetables. Red and yellow types tend to have more vitamin C than green.
2. Kiwi fruit
One medium kiwi has around 60 to 65 mg of vitamin C. Slice it onto porridge or yoghurt, or eat it with a spoon straight from the skin. Kiwis are also a source of fibre and have been studied for their gentle effect on constipation.
3. Oranges and other citrus fruits
A medium orange contains roughly 70 to 80 mg. Grapefruit, clementines, satsumas, mandarins and lemons also contribute. Eating whole fruit gives you fibre, which juice lacks. If you drink juice, the NHS suggests limiting fruit juice and smoothies to a combined 150 ml a day.
4. Strawberries
Half a cup of sliced strawberries provides about 45 to 50 mg. Add them to breakfast bowls, blend them into smoothies or enjoy them as a dessert. Frozen strawberries are a convenient year-round choice.
5. Broccoli
Half a cup of cooked broccoli provides around 50 mg, and raw broccoli contains somewhat more. Steaming for a few minutes keeps it tender and preserves nutrients. Other cruciferous vegetables, such as cauliflower, cabbage and kale, also contribute.
6. Brussels sprouts
Half a cup of cooked Brussels sprouts offers around 45 to 50 mg. Roasting them with olive oil and garlic brings out sweetness and may win over sceptics.
7. Blackcurrants
Blackcurrants are extremely rich in vitamin C, with a small portion providing a large share of daily needs. They are popular in the UK and Europe and are available frozen. Stir them into porridge, make a compote, or blend them into smoothies. Check for added sugars in blackcurrant cordials and jams.
8. Guava
A single guava can deliver more than 100 mg, and some sources quote higher figures. This tropical fruit is available fresh or frozen in many supermarkets and ethnic grocery stores. Eat it raw, add it to fruit salad or blend it into juices.
9. Tomatoes
Tomatoes are not as rich per portion as peppers or citrus, but because we eat them so often, they add up. A medium tomato provides roughly 15 to 20 mg. Tomato juice and tomato-based sauces also contribute, though check the salt content.
10. Potatoes
A medium baked potato with the skin offers around 15 to 20 mg and provides potassium and fibre. Potatoes are a significant source of vitamin C in many diets simply because they are eaten in such quantity. Baking, steaming or boiling in their skins is better than deep-frying.
Easy Ways to Eat More Vitamin C
You do not need to overhaul your diet. Try small additions:
- At breakfast: Add berries or a chopped kiwi to porridge or yoghurt. See our healthy breakfast ideas for more inspiration.
- At lunch: Fill a sandwich or wrap with pepper strips, tomato and salad leaves.
- At dinner: Steam broccoli or roast peppers and Brussels sprouts alongside your main dish.
- As snacks: Keep an orange or clementines in your bag, or pack cherry tomatoes and pepper sticks.
- In smoothies: Blend frozen berries, a handful of spinach and half an orange.
Follow the pattern in our Mediterranean diet guide or 7-day healthy meal plan, and you will probably reach your vitamin C target without trying.
Pairing vitamin C with iron
Vitamin C helps your body absorb non-haem iron, the type found in plant foods, so pairing the two is smart. Squeeze lemon juice over a lentil salad, add pepper strips to a bean chilli, or eat fruit with fortified cereal. Our guide to iron-rich foods has more ideas.
How to Keep Vitamin C in Your Food
Vitamin C is water-soluble and sensitive to heat and air, so some is lost during storage and cooking.
- Eat some fruit and vegetables raw. Peppers, citrus, kiwi and strawberries are easy to eat uncooked.
- Choose steaming, stir-frying or microwaving. Short cooking times with minimal water retain more vitamin C than long boiling.
- Use cooking water. If you boil vegetables, reuse the water in soups or sauces.
- Store sensibly. Keep produce cool and eat it fresh when possible. Frozen fruit and vegetables are usually frozen soon after picking and can retain vitamin C well.
- Cut just before eating. Chopping vegetables long in advance exposes more surface area to air.
Vitamin C, Colds and Supplements
Many people reach for vitamin C when they feel a cold coming on. The NIH Office of Dietary Supplements notes that taking vitamin C regularly does not reduce the chance of catching a cold for most people, though it may slightly shorten colds in some groups. Starting supplements after symptoms begin does not appear to help.
Food is the best source. Supplements may be useful for some people with limited diets, but high doses can cause stomach upset and diarrhoea. In the US, the tolerable upper intake level for adults is 2,000 mg a day. The NHS says that taking 1,000 mg or less a day is unlikely to cause harm, and that larger amounts may cause side effects such as stomach pain and diarrhoea.
Who Should Be Careful
- People with haemochromatosis (iron overload) should avoid vitamin C supplements, because they increase iron absorption.
- People with a history of kidney stones may be advised to avoid high-dose supplements.
- People having chemotherapy or radiotherapy should discuss vitamin C and other antioxidant supplements with their oncology team, as interactions are possible.
- People taking medicines or other supplements should ask a pharmacist before adding vitamin C pills.
- People with food allergies to kiwi, citrus or other fruits should avoid them.
- People taking statins or on blood thinners should not start new supplements without advice.
FAQs
Does cooking destroy all the vitamin C in food?
No. Some is lost, and the amount depends on cooking method and time. Steaming and quick cooking preserve more than long boiling.
Which fruit has the most vitamin C?
Guava, blackcurrants and kiwi fruit are among the richest, along with citrus fruits. Red peppers, a vegetable, are also very high.
Is orange juice a good source of vitamin C?
It provides vitamin C, but also concentrated sugars and fewer fibres than whole fruit. Whole oranges are generally the better choice.
Can I get too much vitamin C from food?
It is very difficult. Excess vitamin C from food is unlikely to cause problems in healthy people. Issues mostly arise from high-dose supplements.
Do I need extra vitamin C in winter?
Not usually, if you eat a balanced diet. Needs do not rise automatically in winter, though people who smoke or have poor diets may fall short.
Conclusion
Getting enough vitamin C is straightforward when your plate includes colourful fruit and vegetables. Peppers, kiwi, citrus, berries, broccoli and even humble potatoes all help. Eat a mix of raw and lightly cooked produce, enjoy them across the week, and save supplements for situations where your healthcare provider recommends them.
This article is for general information only and is not a substitute for personalised medical or dietary advice. Speak to your doctor, pharmacist or registered dietitian before taking supplements, especially if you have a medical condition, are pregnant, or take medication.
