Ever since the beginning of the corona pandemic, awareness around immune health has skyrocketed—especially during the colder months. And while that’s a good thing, it has also led to a flood of misleading information, nutrition myths, and so-called miracle remedies that claim to “boost” immunity overnight.
So what really works when it comes to immune health?
What is the immune system, how does it work, and how can you support it in a sustainable, science-backed way?
In this article, we cut through the noise and explain how to improve your immune system, which nutrients actually matter, and why smart habits beat quick fixes—every time.
What is the immune system?
So, what is the immune system exactly?
Your immune system is your body’s natural defense network. It protects you against harmful pathogens like bacteria, viruses, and other invaders that can make you sick. Most of the time, this system works silently in the background—so efficiently that you don’t even notice it.
Specialized white blood cells, including T cells, constantly patrol your body to identify and neutralize threats. When you do feel unwell or develop a fever, it’s often a sign that your immune system is working overtime to restore balance.
Understanding what the immune system is helps explain why there’s no magic pill for immunity—and why lifestyle, nutrition, and recovery all matter.
Your immune system consists of two main parts:
The innate immune system
This is the protection you’re born with. It includes physical and chemical barriers such as:
- Skin
- Eyelashes and nose hairs
- Stomach acid and enzymes
These act as your first line of defense, stopping pathogens before they enter the body.
The adaptive immune system
This system develops over time. It “learns” by remembering past infections, allowing your body to respond faster and more effectively when it encounters the same pathogen again.
Together, these systems work as a highly coordinated defense team—one that needs the right support to function optimally.
Did you know?
- The average adult catches a cold 2–4 times per year
- 99% of common colds are caused by viruses
No wonder people often ask: why is my immune system so weak?
The answer usually lies in lifestyle factors—not a lack of willpower.
How can I boost my immunity fast?
Let’s clear something up right away:
There’s no way to instantly “boost” your immune system.
What you can do is support and strengthen your immune system consistently. Think long-term, not quick fixes. Prevention always beats recovery.
Key habits that support immune health:
- Regular, moderate exercise
- Sufficient sleep
- Balanced nutrition
- Stress management
These habits help your immune system do what it’s designed to do—every single day.
Does working out put my body and immune system under stress?
Exercise is one of the best things you can do for your health—but intense training does place stress on the body.
For highly active athletes training more than 3 times per week for 60+ minutes, supplementing with 200 mg of vitamin C (on top of daily intake) can help support normal immune function during and after intense exercise.
If you want to keep getting after your goals when you’re not feeling great, our article exercise during a cold or the flu provides information on what you should keep in mind. In most cases, it’s best to get some well-deserved rest rather than keep pushing yourself. Don’t worry, though, you’ll get some great guidance on how to tell when you’re ready to get going again.
Feeling run down? Sometimes rest is the most powerful form of progress. Listening to your body is part of training smart—not training less.
Find out more about vitamins & minerals for active lifestyles and make sure you get enough of these 8 important minerals. Also, check out our Instagram for the ultimate supplement glossary and some great tips on making sense of all the different ones out there.
What are the best vitamins, minerals or other supplements to help my immune system?
Many people searching for how to strengthen the immune system focus on supplements—and for good reason. Certain micronutrients are essential for immune function, skin health, inflammation regulation, and immune cell production.
Vitamins that support immune function:
- Vitamin C
- Vitamin D
- Vitamin A
- Vitamin B6
- Vitamin B12
Key minerals for immunity:
- Zinc
- Copper
- Iron
If your diet doesn’t consistently provide these, supplementation can help support normal immune function—not replace healthy habits.
Vitamin C is already well-known in immunity
Vitamin C is one of the most researched nutrients for immune health. It:
- Contributes to normal immune function
- Helps protect cells from oxidative stress
- Supports collagen formation (important for skin and blood vessels)
You’ll find it in foods like citrus fruits, kiwis, strawberries, and cabbage.
At Body&Fit, we offer targeted formulas like Vitamin C + Rose Hips or Immune Support with Echinacea, designed to fit different goals and lifestyles.
The superfood, Kale, is also a real vitamin C bomb and is high in vitamin A, vitamin K, magnesium and calcium. In our article, Food Fact: Kale, you can learn everything about it and get tips on how to integrate it into your everyday life.
Vitamin D and your immune system
Vitamin D is produced by the body when your skin is exposed to sunlight—but many people don’t get enough, especially in winter.
Vitamin D:
- Supports normal immune function
- Contributes to muscle and bone health
If sun exposure is limited, supplementation like Vitamin D3 (1000 IU or 3000 IU) can help maintain adequate levels.
Vitamin A and immunity
Vitamin A supports:
- Normal immune function
- Maintenance of normal vision
It’s found in animal products like liver, but your body can also convert plant-based carotenoids (from carrots, spinach, and kale) into vitamin A.
⚠️ Pregnant women should monitor vitamin A intake carefully—always follow medical advice.
Vitamins B6 and B12 and the immune system
Vitamin B6 and B12 play key roles in:
- Immune cell production
- Energy metabolism
- Reducing tiredness and fatigue
Vitamin B12 is mainly found in animal products, making supplementation especially important for vegans. Our Vegan Vitamin B12 offers a plant-friendly solution without compromise.
In our article Veganism: Insights, Facts & Supplements, you’ll learn how to further enhance this healthy and sustainable lifestyle with vitamin B12.
Zinc, copper, and iron for immunity
- Zinc supports immune cell function and metabolism
- Copper helps transport iron and supports immune defense
- Iron is essential for oxygen transport and immune health
That’s why balanced formulations—like Zinc paired with Copper—matter.
Immune support products combining multi-ingredients
If managing multiple supplements feels overwhelming, all-in-one formulas can help.
These products combine key vitamins, minerals, and functional ingredients—designed to support immunity conveniently and effectively.
Why do you call your products immune support?
Because honesty matters.
Supplements don’t cure illness or replace healthy habits. They support the normal functioning of your immune system—nothing more, nothing less. A varied diet, good sleep, stress control, and movement always come first.
That’s the Body&Fit way: science-backed, transparent, and focused on long-term progress.
Our 5 top tips to support your immune system
- Get enough sleep – Aim for 7–9 hours per night
- Eat a balanced diet – Vegetables, fruit, fibre, and healthy fats
- Manage stress – Chronic stress weakens immune response
- Exercise regularly – Moderate activity supports immune balance
- Stay hydrated – Fluids help transport nutrients and remove waste
Wondering again why is my immune system so weak?
Start here—small changes, big impact.
Of course, you can always support your immune system with the help of supplements. Find even more great tips, insights and inspiration via our Instagram. If you have any further questions about immune support, products or health and nutrition in general, our Nutrition Experts are always on hand to give you their best advice. It’s all part of our mission to inspire the world to live a fitter and healthier life.
Frequently Asked Questions about the Immune System
How to boost immune system naturally?
Focus on sleep, nutrition, stress management, and consistent movement. Supplements can support—but not replace—these basics.
How to improve immune system long term?
Consistency is key. Daily habits matter more than short-term fixes.
How to strengthen immune system during winter?
Prioritise vitamin D, balanced meals, enough sleep, and recovery from training.
Can supplements replace a healthy diet?
No. Supplements support your immune system when dietary intake is insufficient—but food always comes first.
Sources:
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2: Parkin, J., & Cohen, B. (2001). An overview of the immune system. The Lancet, 357(9270), 1777-1789.
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4: Commission Regulation (EU) No 432/2012 of 16 May 2012 establishing a list of permitted health claims made on foods, other than those referring to the reduction of disease risk and to children’s development and health
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