How to Support Your Immune System

Your immune system plays an essential role in helping your body defend itself against infections and stay healthy. While you can't avoid every cold or illness, everyday habits can help support normal immune function, from eating a balanced diet to getting enough sleep and staying physically active.

Nutrition is an important part of the picture. Several vitamins and minerals contribute to the normal function of the immune system, and getting enough of these nutrients helps your body carry out its everyday processes. ¹

But what should you eat, which nutrients matter most, and can supplements really help?

Here are seven practical ways to support your immune system through nutrition and lifestyle.

1. Eat a varied and balanced diet

One of the best places to start is with your overall diet.

Your immune system needs a range of nutrients to function normally. Rather than relying on one particular food or supplement, aim to eat a variety of foods that provide different vitamins, minerals, protein, healthy fats and fibre. ¹

Try to include:

Fruit and vegetables: Sources of vitamins, minerals and other beneficial plant compounds.
Wholegrains: Foods such as oats, brown rice and wholemeal bread provide fibre and a range of nutrients.
Protein-rich foods: Eggs, fish, poultry, beans, lentils, nuts and seeds help provide the building blocks your body needs.
Dairy or fortified alternatives: These can contribute important nutrients, including vitamin B12 and, where fortified, vitamin D.
Nuts and seeds: Useful sources of nutrients such as zinc, selenium and vitamin E.

The NHS recommends eating at least five portions of a variety of fruit and vegetables each day as part of a balanced diet. ¹

You don't need to make dramatic changes overnight. Start by adding more variety to your meals and choosing nutritious options that fit comfortably into your routine.

2. Get enough vitamin C

Vitamin C is one of the nutrients commonly associated with immune health, and for good reason: it contributes to the normal function of the immune system. ²

It also helps protect cells from oxidative stress and supports normal collagen formation, which is important for healthy skin and other tissues.

Fortunately, vitamin C is found in plenty of everyday foods, including:

Oranges and other citrus fruits
Strawberries and blackcurrants
Red and green peppers
Broccoli and Brussels sprouts
Potatoes

Including a variety of fruit and vegetables in your diet can help you get the vitamin C you need.

But is taking extra vitamin C better? Not necessarily. If you're already getting enough, taking additional vitamin C isn't guaranteed to improve your immune function. Large doses of vitamin C supplements can also cause digestive side effects. ²

Focus on your regular diet first, and consider supplements where there is a genuine need.

3. Pay attention to vitamin D

Vitamin D plays several important roles in the body, including contributing to the normal function of the immune system. ³

Unlike many other vitamins, your body can produce vitamin D when your skin is exposed to sunlight. However, in the UK, sunlight is not strong enough for this throughout the year, and relatively few foods naturally contain substantial amounts of vitamin D.

Food sources include:

Oily fish, such as salmon and sardines
Egg yolks
Red meat
Some fortified foods, including certain breakfast cereals and fat spreads

The NHS advises that everyone should consider taking a daily supplement containing 10 micrograms of vitamin D during autumn and winter. Some people may need to take a supplement throughout the year, including those who spend little time outdoors or cover most of their skin when outside. ³

This makes vitamin D particularly worth considering as the seasons change. However, follow current guidance and avoid assuming that higher doses will provide greater benefits.

4. Don't overlook zinc and selenium

Vitamins often get the most attention when it comes to immunity, but minerals matter too.

Zinc contributes to the normal function of the immune system and is involved in many processes in the body. ⁴ Good food sources include meat, shellfish, dairy products, bread, cereals and nuts.

Selenium also contributes to the normal function of the immune system. ⁴ You can find it in foods such as fish, meat, eggs and nuts.

Other nutrients, including vitamin A, vitamin B6, vitamin B12, folate, iron and copper, also have roles in normal immune function. ¹

The key is to avoid focusing too heavily on a single nutrient. A varied diet is more likely to provide the combination of vitamins and minerals your body needs.

It's also important not to take high doses of minerals without a good reason. For example, taking too much zinc over time can interfere with copper absorption and potentially cause health problems. ⁴

5. Support your gut with fibre-rich foods

Your gut and immune system are closely connected, making digestive health another useful consideration when thinking about overall wellbeing.

Fibre helps support normal digestion and is found in plant foods such as wholegrains, fruit, vegetables, beans, lentils, nuts and seeds. Eating a variety of these foods helps you increase your fibre intake while providing a range of other nutrients.

Simple ways to add more fibre include:

Choosing porridge or a higher-fibre cereal for breakfast.
Adding beans or lentils to soups, curries and salads.
Eating a variety of vegetables with your main meals.
Snacking on fruit, nuts or seeds.
Choosing wholemeal bread and wholegrain versions of rice or pasta.

You don't need to overhaul your diet all at once. Increase fibre gradually and drink enough fluids to help your digestive system adjust.

Although gut health is an active area of research, no single food or supplement can guarantee better immunity. A varied, balanced diet remains a sensible foundation for supporting overall health. ¹

6. Make sleep and exercise part of your routine

Nutrition is important, but your everyday habits matter too. Prioritise sleep. Getting enough quality sleep supports general health and normal immune function. Try to maintain a regular bedtime, create a relaxing evening routine and give yourself enough time to rest.

Stay physically active. Regular movement supports overall health and can contribute to better sleep, mood and energy levels. ⁵ You don't need to spend hours at the gym: walking, cycling, gardening and other activities you enjoy can all help you build movement into your day.

Manage stress where possible. Long periods of stress can affect wellbeing and make healthy routines harder to maintain. Taking breaks, spending time outdoors and making space for activities you enjoy may help you manage everyday pressures.

None of these habits guarantees that you won't become ill, but together they can contribute to a healthier lifestyle.

7. Be realistic about immune supplements

Supplements can be useful when your diet doesn't provide enough of a particular nutrient or when you have an identified need. However, they aren't a substitute for healthy habits, and taking more isn't necessarily better.

Vitamin C, vitamin D, zinc and other nutrients contribute to normal immune function. But this doesn't mean that high-strength supplements will automatically prevent infections or stop you catching a cold. ⁶

Before choosing a supplement, consider:

Your diet: Are you regularly eating foods that provide a range of vitamins and minerals?
Your individual needs: Do your age, lifestyle or dietary choices mean you may need additional support?
The dosage: Does the product provide an appropriate amount of each nutrient?
Overlapping ingredients: Are you already getting the same nutrients from a multivitamin or another supplement?

Taking excessive amounts of certain vitamins and minerals can be harmful, particularly over long periods. If you're pregnant, taking medication, managing a health condition or unsure what you need, speak to a healthcare professional for advice.

A simple daily routine for immune health

Supporting your immune system doesn't have to involve complicated plans or lots of different supplements.

Here are a few simple habits to build into your day:

Habit	Simple way to put it into practice
Eat a varied diet	Include fruit, vegetables, wholegrains and protein-rich foods
Get your five a day	Add fruit to breakfast and vegetables to lunch or dinner
Include nutrient-rich foods	Eat sources of vitamin C, zinc and selenium regularly
Consider vitamin D	Follow UK guidance on supplementation, particularly in autumn and winter
Stay hydrated	Drink fluids regularly throughout the day
Move more	Go for a walk or find an activity you enjoy
Prioritise sleep	Aim for a consistent routine and enough rest

Small, sustainable habits are often easier to maintain than trying to change everything at once.

FAQs

How can I support my immune system naturally?

Focus on a varied and balanced diet, regular physical activity, adequate sleep and good everyday hygiene. These habits support general health and normal immune function, although they cannot guarantee that you won't catch an infection.

Which vitamins are important for the immune system?

Vitamins A, B6, B12, C and D, along with folate, contribute to normal immune function. Minerals such as zinc, selenium, iron and copper are also involved. ¹

Does vitamin C prevent colds?

Vitamin C is essential for normal immune function, but taking extra vitamin C does not guarantee that you'll avoid a cold. Most people should be able to obtain the vitamin C they need through a varied and balanced diet. ²

Should I take vitamin D in winter?

The NHS advises that everyone should consider taking a daily 10-microgram vitamin D supplement during autumn and winter. Some people are advised to take it throughout the year. ³

Can supplements boost your immune system?

Supplements can help address inadequate nutrient intake, and certain vitamins and minerals contribute to normal immune function. However, supplements cannot guarantee protection against illness, and excessive doses can be harmful. ⁶

Does poor sleep affect your immune system?

Sleep is an important part of overall health and supports normal immune function. If you regularly struggle to sleep, consider reviewing your sleep routine and seeking advice if the problem continues.

Supporting your immune system starts with looking after your overall health.

Eat a variety of nutritious foods, pay attention to nutrients such as vitamins C and D, zinc and selenium, stay active and make sleep a priority. Supplements can play a role when needed, but there's no single food, vitamin or product that can guarantee protection against illness.

Focus on the everyday habits you can maintain, and remember that consistency matters more than chasing a quick fix.