Vitamin C: Benefits, RDA, and More

Vitamin C is one of the most talked-about nutrients in the UK, and for good reason. It plays a genuine role in immune support, skin health and everyday energy, which is why it's a staple in so many households, especially through the autumn and winter months.

This guide explains what vitamin C actually does, how much you need, the best food sources, and how to choose a quality supplement if your diet needs a top-up.

What is vitamin C?

Vitamin C (ascorbic acid) is a water-soluble vitamin, which means the body doesn't store it, so any extra is passed out rather than saved for later. That's why a steady daily intake, through food or a supplement, matters more than it does for fat-soluble vitamins like D or E.

Humans can't make their own vitamin C (unlike most animals), so it has to come from diet or supplementation.

Why vitamin C matters

Vitamin C has several health benefits authorised by European food-safety regulators. Vitamin C contributes to:

• Normal function of the immune system
• Normal collagen formation, for the normal function of blood vessels, bones, cartilage, gums, skin and teeth
• A reduction of tiredness and fatigue
• Normal energy-yielding metabolism
• Normal functioning of the nervous system
• Normal psychological function
• The protection of cells from oxidative stress
• Increased iron absorption from food

These are everyday-wellness benefits. Vitamin C maintains normal function; it isn't a treatment for any illness.

The main benefits people choose vitamin C for

1. Everyday immune support

This is the number one reason people reach for vitamin C. It contributes to the normal function of the immune system, including during and after intense physical exercise, which is why it's popular year-round and especially in colder months.

2. Skin, joints and collagen

Vitamin C is essential for normal collagen formation, the protein that supports skin, gums, cartilage and blood vessels. This is one reason it's a common ingredient alongside beauty-focused supplements like collagen peptides.

3. Better iron absorption

Vitamin C increases the absorption of iron from plant-based (non-haem) food sources, which is why it's often recommended alongside iron-rich meals or supplements such as liposomal iron.

4. Antioxidant protection

As an antioxidant, vitamin C helps protect cells from oxidative stress caused by everyday factors like pollution and normal metabolic processes.

5. Easing everyday tiredness

Vitamin C contributes to the reduction of tiredness and fatigue and to normal energy-yielding metabolism, making it a popular choice for people who feel run down by busy weeks.

How much vitamin C do you need?

In the UK, the NHS recommends adults get about 40mg of vitamin C a day, which most people can reach through diet alone. The Nutrient Reference Value (NRV) used on UK supplement labels is 80mg a day.

A few practical pointers:

• Because it's water-soluble, spreading your intake across the day (rather than one large dose) can help maintain steadier levels.
• The NHS advises against taking more than 1,000mg a day long-term, as very high doses can cause stomach pain, diarrhoea and flatulence.
• Smokers may need more vitamin C, as smoking increases the body's requirement.

Best food sources of vitamin C

Vitamin C is found in a wide range of fruits and vegetables, including:

• Citrus fruits (oranges, grapefruit) and blackcurrants
• Peppers, especially red and yellow peppers
• Strawberries and kiwi fruit
• Broccoli, Brussels sprouts and potatoes

Cooking can reduce vitamin C content, so raw or lightly cooked vegetables retain more of it.

Is vitamin C supplementation safe?

For most healthy adults, vitamin C supplements are well tolerated when taken as directed. As with any supplement, speak to your GP or pharmacist first if you are pregnant, breastfeeding, taking medication or under medical supervision.

Choosing a quality vitamin C supplement

When demand for a nutrient rises, so does the number of low-quality products. Look for:

• A clearly labelled dose in milligrams per serving
• Trusted manufacturing: Orzax produces in facilities holding ISO 9001, ISO 22000 and GMP certifications, with rigorous lab testing
• A brand that stands behind its products: Orzax UK offers a 30-day money-back guarantee

Orzax's Vitamin C Effervescent Tablets offer a convenient daily dose that dissolves in water. Explore the vitamin supplements collection or browse the full supplement range.

Frequently Asked Questions

What does vitamin C actually do? It contributes to normal immune function, collagen formation for skin and joints, iron absorption, and a reduction of tiredness and fatigue, among other everyday roles in the body.

How much vitamin C should I take a day? The UK NRV is 80mg a day. The NHS recommends adults get around 40mg daily from food, and advises against exceeding 1,000mg a day long-term.

Can I take too much vitamin C? Very high doses (well above 1,000mg a day) can cause digestive upset such as stomach pain and diarrhoea. Because it's water-soluble, excess is generally passed out rather than stored.

Does vitamin C help with iron absorption? Yes, vitamin C increases the absorption of iron from plant-based food sources, which is why it's often paired with iron-rich meals or supplements.

What foods are highest in vitamin C? Citrus fruits, blackcurrants, peppers, strawberries, kiwi fruit and broccoli are among the richest natural sources.

The bottom line

Vitamin C supports the immune system, skin, energy and iron absorption, but as a water-soluble vitamin it needs a steady daily supply rather than a one-off dose. Most people can get enough through a varied diet rich in fruit and vegetables, and a supplement like Orzax's Vitamin C Effervescent Tablets can help cover the gap on busier days.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or under medical supervision, speak to your GP or pharmacist before starting a new supplement. Do not exceed the recommended daily dose.