The Best Nutrients to Support Your Immune System

Supporting your immune system is something many of us think about more at certain times of the year. In fact, data from Google Trends shows that searches for terms like ‘vitamins for the immune system’ and ‘foods to boost the immune system’ tend to increase during the winter months.

Now, this trend could be due to a decline in vitamin D or to seasonality-related differences in pathogen strains. However, immune health should be a year-round consideration, as your immune system constantly works to protect your body, regardless of the season.

While the immune system is often talked about as something you can ‘improve’, it’s actually far more complex than that. Immune health depends on many factors working together, including sleep, stress levels, physical activity, and, importantly, nutrition.

Here, we take a closer look at the best nutrients for immune system support, explain how they contribute to normal immune function, and explore where you can find them in everyday foods. We also explore how supplements can fit into a balanced approach to immune nutrition, without replacing a healthy, varied diet.

What Does the Immune System Actually Do?

The immune system is a complex network of cells, tissues, and processes that work together to protect the body. Rather than being a single on-off switch, it relies on constant coordination between different systems to function normally.

Immune cells need energy, structural components, and signalling molecules to do their job. Many of these come directly from the nutrients we consume through food. Vitamins and minerals don’t “activate” the immune system, but they support its normal function by helping immune cells develop, communicate, and respond appropriately.

This is why immune health isn’t about finding one “miracle” nutrient. Instead, it’s about consistently supplying the body with a range of essential nutrients that support immune function as part of everyday physiology.

Why Nutrition Matters for Immune Health

Nutrition plays a foundational role in supporting normal immune function. Every day, immune cells rely on a steady supply of vitamins and minerals to grow, communicate, and respond to challenges in the body.

Some nutrients are involved in the development and maintenance of immune cells, while others help protect cells from oxidative stress or support normal metabolic processes on which immune function depends. When the body has access to these nutrients in adequate amounts, it’s better equipped to maintain a healthy immune response.

A varied, balanced diet is the starting point. Foods such as fruits, vegetables, whole grains, nuts, seeds, and protein-rich foods naturally provide many of the vitamins and minerals the immune system needs. However, dietary patterns, seasonal eating habits, and lifestyle factors can all influence how consistently these nutrients are consumed.

It’s also important to recognise that immune health doesn’t exist in isolation. Factors such as sleep quality, physical activity, and stress levels all interact with nutrition to support the immune system’s normal function. Rather than focusing on a single nutrient or quick fix, immune nutrition is best approached as part of a broader, long-term routine.

The Most Important Nutrients for Immune System Function

This section explores some of the most important nutrients for immune system health, where they’re found in food, and how they fit into a balanced diet.

Vitamin A

Vitamin A contributes to the normal function of the immune system and supports the maintenance of normal mucous membranes, which form part of the body’s natural physical defences.

Discover more about vitamin A in our guide – What is Vitamin A and Why Do We Need It?

Foods that contain vitamin A include:

• Liver and dairy products
• Eggs
• Orange and green vegetables such as carrots, sweet potatoes, and spinach

Vitamin A is fat-soluble, so it’s best absorbed as part of a balanced meal that includes dietary fat.

B vitamins (Vitamin B6, Folate, and Vitamin B12)

Several B vitamins contribute to the normal function of the immune system, including vitamin B6, folate (vitamin B9), and vitamin B12.

These nutrients are also involved in normal energy metabolism and the formation of red blood cells, which support overall physiological function — including immune processes.

Foods that contain B vitamins include:

• Whole grains
• Legumes
• Leafy green vegetables
• Meat, fish, eggs, and dairy

Because different B vitamins are found across a wide range of foods, dietary variety is key.

For more on B-vitamins, head to our guide: The B-Vitamin Complex? Less Complex Than You Might Think.

Vitamin C

Vitamin C is one of the most well-known immune system vitamins, and for good reason. It contributes to the normal function of the immune system and helps protect cells from oxidative stress.

It also supports normal energy metabolism and the function of the nervous system, which, in turn, indirectly supports immune health by helping the body cope with everyday physical demands.

Foods that contain vitamin C include:

• Citrus fruits such as oranges and grapefruits
• Berries
• Kiwi
• Peppers and leafy greens

Vitamin C is water-soluble, meaning the body doesn’t store large amounts. Regular intake through food or supplementation, where appropriate, can help maintain consistent intake.

Vitamin E

Vitamin E contributes to protecting cells from oxidative stress. This is important because immune cells, like all cells in the body, can be affected by oxidative damage during normal metabolic processes.

By helping protect cells, vitamin E supports the conditions needed for the immune system to function normally.

Foods that contain vitamin E include:

• Nuts and seeds
• Vegetable oils
• Whole grains

Vitamin E is another fat-soluble vitamin, meaning dietary fat is required for its absorption.

Learn more about this vitamin in our helpful guide – What is Vitamin E & What Are The Benefits?

Zinc

Zinc contributes to the normal function of the immune system and helps protect cells from oxidative stress. It’s involved in many enzymatic reactions in the body, including those linked to immune cell development and function.

Foods that contain zinc include:

• Meat and shellfish
• Seeds and nuts
• Whole grains and legumes

Zinc intake can vary depending on dietary patterns, particularly in plant-based diets. Read our guide for key information about zinc and more with From A to Zinc: What Are Vitamins & Why They Matter.

Selenium

Selenium contributes to the normal function of the immune system and to the protection of cells from oxidative stress.

It’s required in small amounts, but intake can vary widely depending on food choices and soil content where foods are grown.

Foods that contain selenium include:

• Brazil nuts
• Fish and seafood
• Eggs

Copper

Copper contributes to the normal function of the immune system and helps protect cells from oxidative stress.

Although required only in small amounts, copper is an essential trace mineral that supports several normal physiological processes.

Foods that contain copper include:

• Nuts and seeds
• Whole grains
• Legumes

Foods to Support Your Immune System Nutrition

A healthy immune system starts with a varied, balanced diet. Many of the nutrients that support normal immune function are naturally found in everyday foods, which is why dietary variety is so important for immune health.

Rather than focusing on individual “superfoods”, it can be more helpful to think in terms of food groups that regularly provide key vitamins for the immune system.

Fruits and vegetables

Fruits and vegetables are rich sources of vitamins, minerals, and plant compounds that support normal physiological function. Vitamin C, vitamin A, and folate are commonly found in colourful produce, particularly when a range of colours is included in the diet.

Examples include:

• Citrus fruits, berries, and kiwi
• Leafy greens such as spinach and kale
• Orange and red vegetables like carrots, squash, and peppers

Eating a variety of fruits and vegetables helps provide a broader nutrient profile than relying on a single option.

Protein-rich foods

Protein plays an essential role in the body, including the production and maintenance of immune cells. Many protein-rich foods also provide important minerals such as zinc, selenium, and copper.

Examples include:

• Meat, poultry, and fish
• Eggs and dairy products
• Legumes such as lentils, beans, and chickpeas

Including a mix of animal- and plant-based protein sources can help support a more diverse nutrient intake.

Whole grains, nuts, and seeds

Whole grains, nuts, and seeds contribute B vitamins, minerals, and fibre, all of which support normal metabolic processes that immune function depends on.

Examples include:

• Oats, brown rice, and wholegrain bread
• Almonds, walnuts, and sunflower seeds
• Pumpkin seeds and sesame seeds

These foods are also valuable for overall dietary balance and energy intake.

Dietary variety matters

While individual nutrients are important, immune health is best supported through consistency and variety over time. Seasonal eating habits, busy schedules, and personal preferences can all influence food choices, which is why immune nutrition looks different from person to person.

For many people, maintaining a wide variety of nutrient-rich foods every day can be challenging, especially during the winter months. This is where some people consider supplements as a way to complement their diet, rather than replace it.

Can Supplements Help Support Immune Nutrition?

A balanced, varied diet is the foundation of good nutrition, including nutrients that contribute to normal immune function. In an ideal world, all essential vitamins and minerals would come from food alone. In reality, dietary patterns, seasonal availability, lifestyle demands, and personal preferences can make consistency more difficult.

This is where dietary supplements may play a role for some people. Supplements are designed to complement the diet, not replace whole foods or a healthy lifestyle. When used appropriately, they can help support regular intake of certain nutrients as part of a broader nutrition routine.

For example, people with limited dietary variety, busy schedules, or changing nutritional needs may find it challenging to consume a wide range of immune-supporting nutrients every day. Supplements can offer a practical way to support nutrient intake without relying on a single food source.

It’s also important to approach supplements with realistic expectations. No supplement can replace the benefits of a balanced diet, adequate sleep, physical activity, and stress management. Immune nutrition works best when it’s part of a consistent, long-term approach rather than a short-term fix.

How AG1 Fits Into an Immune-Supporting Routine

Supporting normal immune function is about consistency rather than quick fixes. As we’ve found, the immune system relies on a range of vitamins and minerals that each contribute to its normal function within everyday physiology.

Our scientists have designed AG1 as a dietary supplement to complement a healthy, varied diet, providing a broad range of vitamins, minerals, and other nutrients in one daily serving. These include several nutrients that are authorised to contribute to the normal function of the immune system, such as vitamin C, vitamin A, vitamin B6, vitamin B12, folate, zinc, selenium, and copper.

Explore the full range of AG1 ingredients.

Rather than focusing on a single nutrient, we take a multi-nutrient approach, reflecting the fact that immune health depends on many systems working together. This approach is intended to support regular nutrient intake as part of a wider lifestyle that includes balanced nutrition, sufficient sleep, and physical activity — not to replace them.

AG1 is clinically researched, with studies on its formula assessing nutrient absorption, nutrient status, changes in the microbiome, and gastrointestinal tolerability. As with all dietary supplements, individual responses may vary. These studies must be interpreted carefully, and they do not suggest prevention, treatment, or cure of disease.

It’s also important to note that AG1 is not designed to provide every nutrient the body needs, nor is it intended to substitute a healthy diet or lifestyle. Instead, it can be used as part of a routine that supports overall nutritional intake, including nutrients that contribute to normal immune function, within the context of a balanced approach to health

Ultimately, immune health is shaped by everyday habits over time. For those looking for a simple, consistent way to complement their diet with a range of key nutrients, AG1 offers a practical option that fits into a broader, long-term approach to wellbeing.

AG1 is your daily, drinkable scoop of vitamins, minerals, and more. Explore what goes into each scoop in our guide – What is AG1?

Or, discover more information and insight into how our bodies work and interact with nutrients with the following guides:

• What are Gut Bacteria and Why do they Matter?
• Why Bioavailability Matters in Your Nutrition