Biohacking Biology - How To Support The Immune System
Medically Reviewed By: Adam Gavine, BHK, M.Chiro
Original Published: February 2019
Updated On: February 2026
Understand how nutrition, sleep, movement and appropriate healthcare contribute to normal immune function - and why supplements are not a shortcut.
The immune system is an intricate network of cells, tissues and organs that helps the body recognise and respond to infectious organisms and other potential threats.
It is common to see products, diets and treatments advertised as ways to “boost” or “supercharge” immunity. However, the immune system is not a battery that can simply be charged above its normal level. An overactive immune response can itself be harmful, as occurs with allergies and autoimmune conditions.
A more accurate goal is to support normal immune function while addressing deficiencies, health conditions and lifestyle factors that may affect it.
There is no food, supplement, exercise or manual treatment that can guarantee you will avoid an infection. Vaccination, appropriate hygiene, medical care and evidence-based public-health advice remain important. Everyday habits can nevertheless support your general health and provide the nutrients and recovery your immune system needs to function normally.
How Does the Immune System Work?
The immune system has several overlapping layers of defence.
Physical barriers
The skin and the lining of the respiratory and digestive systems help prevent potentially harmful organisms from entering the body.
Mucus, tears and saliva also contribute to these protective barriers.
Innate immunity
Innate immunity responds quickly when the body detects a possible threat. It involves immune cells and inflammatory processes that help contain and remove harmful organisms.
Inflammation is therefore not inherently bad. It is a normal part of defence and tissue repair. Problems can arise when inflammation is excessive, prolonged or driven by an underlying medical condition.
Adaptive immunity
Adaptive immunity develops a more targeted response. It includes B cells, T cells and antibodies that recognise specific organisms.
This part of the immune system also creates memory, allowing a faster response following future exposure. Vaccination uses this ability to train the immune system without requiring a person to experience the full effects of the disease.
What Influences Immune Function?
Immune function is affected by many factors, some modifiable and others not.
These can include:
Age
Genetics
Vaccination history
Chronic medical conditions
Certain medications
Nutritional deficiencies
Sleep quality
Physical activity
Smoking
Alcohol consumption
Psychological stress
Pregnancy
Recent illness or surgery
Exposure to infectious organisms
A healthy lifestyle cannot override every factor. Someone with an immune disorder, significant deficiency or chronic illness requires appropriate medical care—not simply a general wellness plan.
Eat a Varied, Balanced Diet
The immune system requires energy, protein, vitamins and minerals to perform its normal functions. The most reliable way for most adults to obtain these nutrients is through a varied diet rather than a collection of high-dose supplements.
Aim to include:
Vegetables of different colours
Whole fruits
Wholegrain or high-fibre carbohydrates
Legumes, nuts and seeds
Eggs, seafood, lean meat or suitable plant proteins
Milk, yoghurt or appropriate alternatives
Sources of unsaturated fats
Sufficient fluids
Variety matters because no single food provides every required nutrient.
Protein is particularly important for maintaining and repairing body tissues. Sources may include fish, chicken, eggs, dairy products, tofu, lentils, chickpeas, beans, nuts and seeds.
Fibre from vegetables, fruits, legumes and whole grains also supports the gut microbiome. The relationship between gut health and immunity is an active area of research, but this does not justify expensive “immune detoxes” or unproven microbiome products.
Vitamin C: Necessary, but More Is Not Always Better
Vitamin C is an essential nutrient involved in antioxidant activity, collagen production and normal immune function.
Foods containing vitamin C include:
Capsicum
Kiwifruit
Citrus fruit
Strawberries
Guava
Broccoli
Tomatoes
Brussels sprouts
Most people can meet their needs by regularly eating fruit and vegetables. Healthdirect reports an Australian recommended dietary intake of approximately 45 mg per day for adults, with different requirements during pregnancy and breastfeeding.
High doses do not continually improve immunity once nutritional needs have been met. Excess supplemental vitamin C may cause diarrhoea, abdominal discomfort or nausea, and it may be inappropriate for people with certain health conditions.
Claims that liposomal vitamin C is absorbed with near-perfect efficiency or provides superior protection from infection are not sufficiently established to support routine clinical recommendations.
For practical information about dietary sources, deficiency and supplementation, see Healthdirect’s guidance on vitamin C.
Zinc: Essential but Potentially Harmful in Excess
Zinc contributes to normal immune function, wound healing and many cellular processes. Food sources include:
Seafood
Meat
Dairy products
Eggs
Legumes
Nuts
Seeds
Whole grains
Zinc supplementation may be appropriate when dietary intake is insufficient or a deficiency has been identified. It should not be assumed that a larger dose will provide stronger protection.
Excessive or prolonged zinc supplementation can cause:
Nausea and digestive upset
Copper deficiency
Changes in blood counts
Interactions with some antibiotics
Neurological complications in severe cases
Check the amount of elemental zinc rather than only the total weight of the zinc compound listed on the label.
Discuss regular zinc supplementation with a GP, Accredited Practising Dietitian or pharmacist, particularly if you take prescription medication.
Vitamin D: Test and Treat Deficiency Appropriately
Vitamin D contributes to bone and muscle health and is involved in immune regulation. The body produces vitamin D in response to ultraviolet radiation, and smaller amounts can be obtained from selected foods.
People at greater risk of deficiency may include those who:
Spend limited time outdoors
Have naturally dark skin
Cover most of their skin
Live with conditions that affect absorption
Take certain medications
Are frail, older or largely housebound
Have obesity
Have previously recorded low vitamin D
The original article suggested obtaining unprotected sun exposure before applying sunscreen. That advice is too general for Australia, where skin type, location, season and the UV Index materially change the risk.
Cancer Council Australia advises that overexposure to UV is never recommended as a treatment for vitamin D deficiency. It also reports that sunscreen use has minimal impact on vitamin D levels over time. Read the Cancer Council’s vitamin D and sun-safety guidance.
If you are concerned about deficiency, speak with your GP. A blood test and an appropriate supplement may offer a safer, more measurable approach than deliberate unprotected UV exposure.
Do Immune-Boosting Supplements Work?
Supplements can correct or help prevent a nutrient deficiency. That is different from “boosting” an already adequately nourished immune system.
For most generally healthy adults:
Supplements cannot replace a varied diet
Larger doses do not necessarily provide larger benefits
“Natural” does not automatically mean safe
Multiple products may contain the same nutrient
Supplements can interact with medicines
Quality and evidence vary between products
Benefits may be limited when no deficiency exists
Be cautious of claims that a product:
Prevents viral infection
Replaces vaccination
“Detoxifies” the immune system
Works for everyone
Produces immediate immune protection
Is safe at any dose
Does not need to be discussed with a healthcare professional
Before beginning a supplement, ask:
Is there evidence that I am deficient?
Can I reasonably obtain this nutrient through food?
What is the recommended dose?
Does the product duplicate another supplement?
Could it interact with my medication?
How long should I take it?
How will we determine whether it is still required?
A GP or Accredited Practising Dietitian is better placed to assess nutritional deficiency and prescribe therapeutic supplementation than a clinician working outside their nutritional scope.
Prioritise Consistent, Restorative Sleep
Sleep supports many aspects of physical and mental health, including normal immune regulation.
Most adults require approximately seven to nine hours, although individual needs vary. Sleep quality and regularity matter as well as total time.
Helpful habits may include:
Keeping a reasonably consistent waking time
Creating a dark, quiet sleep environment
Reducing caffeine later in the day
Limiting alcohol near bedtime
Establishing a wind-down routine
Reducing stimulating screen use before bed
Exercising regularly
Seeking help for persistent insomnia, snoring or suspected sleep apnoea
One poor night will not “switch off” your immune system. The concern is a persistent pattern of inadequate or disrupted sleep.
If sleep problems continue despite sensible changes, speak with your GP.
Move Regularly Without Overtraining
Regular physical activity supports cardiovascular health, metabolic health, mood, sleep and physical function. These broader benefits create a healthier foundation for normal immune function.
A sustainable routine might include:
Walking
Strength training
Cycling
Swimming
Social sport
Dancing
Gardening
Mobility and balance activities
Begin at a level appropriate for your current health and gradually increase the frequency, intensity or duration.
More exercise is not always better. High training loads combined with inadequate sleep, insufficient energy intake or limited recovery can leave an athlete feeling run down.
Signs that your current program may need review include:
Persistent fatigue
Declining performance
Repeated illness
Ongoing muscle soreness
Irritability
Disrupted sleep
Loss of motivation
Recurrent injuries
These symptoms are not specific to overtraining and may require medical assessment.
Manage Stress Without Blaming Yourself
Ongoing psychological stress can influence sleep, eating habits, physical activity and the regulation of several body systems. Stress management is therefore part of general health care.
Useful options may include:
Regular movement
Time outdoors
Relaxation or breathing exercises
Maintaining social connection
Setting realistic workloads
Taking breaks from continuous news or social media
Speaking with a psychologist or counsellor
Seeking medical care for persistent anxiety or depression
Stress is not a personal failure, and relaxation techniques are not substitutes for professional mental-health care when it is needed.
Avoid Smoking and Moderate Alcohol
Smoking damages the respiratory system and affects several aspects of immune defence. If you smoke or vape and would like help stopping, speak with your GP or contact an evidence-based cessation service.
Alcohol can disrupt sleep and affect general health. Heavy or frequent consumption may also interfere with nutrition and immune function.
Australian alcohol guidance should be considered alongside your individual health, medication use and pregnancy status. Some people should avoid alcohol completely.
Use Proven Infection-Prevention Measures
Supporting your general health does not replace measures that reduce exposure or the risk of severe disease.
Depending on the illness and current public-health advice, these may include:
Recommended vaccination
Hand hygiene
Staying home when acutely unwell
Appropriate ventilation
Respiratory etiquette
Food-safety practices
Avoiding close contact with vulnerable people while infectious
Seeking timely medical advice
If you develop severe symptoms, breathing difficulty, chest pain, confusion or another medical emergency, call Triple Zero (000).
What to Expect at Back To Function
Back To Function does not diagnose or treat immune disorders, and chiropractic care has not been established as a way to prevent infection or “boost” the immune system.
Dr Adam Gavine’s role is centred on musculoskeletal assessment, physical medicine and rehabilitation. During a consultation for a movement-related concern, he may discuss general factors that affect recovery, such as:
Sleep
Exercise volume
Physical activity
Work demands
Stress and recovery
General nutrition habits
Relevant health conditions
This information helps place a musculoskeletal concern in context. Depending on your presentation, care may include:
Chiropractic manual therapy
Active Release Techniques®
Myofascial treatment
Exercise rehabilitation
Activity and workload advice
Kinesio Taping where appropriate
Referral to a GP or another qualified professional
If symptoms suggest nutritional deficiency, infection, an immune disorder or another medical concern, you will be advised to consult an appropriately qualified practitioner.
A GP may arrange pathology testing or medical treatment. An Accredited Practising Dietitian can provide individual dietary assessment and nutrition therapy. A pharmacist can advise on medicine and supplement interactions.
Build Health Through Consistent Habits
There is no single method for “supercharging” the immune system. Normal immune function depends on a complex interaction between your biology, health history, environment and daily habits.
The most reliable foundations are less dramatic than supplement advertising suggests:
Eat a varied, nutrient-rich diet
Sleep consistently
Remain physically active
Allow adequate recovery
Avoid smoking
Moderate alcohol
Follow recommended vaccination and public-health advice
Correct deficiencies with qualified guidance
Seek medical care when symptoms warrant it
If pain or reduced movement is making it difficult to remain active, Dr Adam Gavine can assess the musculoskeletal factors affecting your function and discuss an appropriate rehabilitation plan.
To arrange an initial chiropractic consultation at Back To Function, call 0468 749 223, email adam@backtofunction.com.au, or book online.
Appointments are available for patients from Mona Vale, Sydney’s Northern Beaches and the Central Coast.
This article provides general information only. It is not a substitute for medical, nutritional or pharmaceutical advice and does not recommend supplements for any individual.
AUTHOR BIO
Dr Adam Gavine, BHK, M.Chiro, is the Director and Chiropractor at Back To Function. With more than 19 years of clinical experience, he has a special interest in sports rehabilitation, musculoskeletal function and soft-tissue health.
Adam is a full-body certified Active Release Techniques® (ART) provider—one of only a handful in Australia—and co-founder of the Wasabi Method, a shockwave therapy education and clinical partnership. He is currently completing a PhD at the University of Sydney and provides care to patients across Sydney’s Northern Beaches and the Central Coast.
READ MORE
What Should a Balanced Meal Look Like? — A practical framework for building more varied, balanced meals
How You Could Benefit from Seeing a Nutritionist and What to Expect — The role of individual nutrition assessment and sustainable dietary guidance
The Detrimental Effects of a Sedentary Lifestyle — How regular movement supports physical function and broader health
Go Hard, Then Go Home and Recover — Why sleep, stress management and recovery matter alongside exercise
