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Boosting the immune system

Published on December 2, 2025 at 3:00 / Updated on December 16, 2025 at 8:01

The immune system is the body's line of defence. It protects the body from foreign elements that pose a threat to its physical health and survival such as bacteria, viruses, parasites, fungi or cancer cells. A healthy immune system stands a better chance of fighting off infections and diseases.

How does the immune system work?

The immune system is highly complex and involves several organs and cells. The first line of defence consists of physical barriers such as the skin and the mucous membranes. The second line of defence involves the bone marrow where immune cells, known as leukocytes (or white blood cells), are produced.

When the body fights certain viruses and microbes, it has the ability to "remember" invading foreign substances to mount a better immune response upon a second encounter. This remarkable feature comes from antibodies produced by B lymphocytes, a type of white blood cell.

The vaccines' mechanism of action uses immune memory: a small quantity of weakened or inactivated viruses or bacteria is administered so the body can build immunity to better defend itself in the future.

What can affect the immune system?

Several factors can weaken the immune system:

  • Malnutrition
  • Old age
  • Certain diseases, especially chronic and severe diseases (diabetes, cancer, HIV, etc.)
  • Kidney or liver diseases
  • Certain medications, such as chemotherapy

How can I tell if my immune system is weak?

Certain symptoms may be indicative of a weakened immune system:

  • A tendency to develop various infections (sinusitis, otitis, bronchitis, etc.)
  • Chronic diarrhea and growth delay in children
  • Lack of appetite
  • Weight loss
  • Mouth ulcers

What can I do to strengthen my immune system?

Here are some healthy habits to help support your immune system:

  • Eat a wide range of brightly coloured fruits and vegetables
  • Practice good sleep hygiene
  • Be physically active
  • Avoid smoking
  • Avoid stress

Can natural health products boost the immune system?

Although several natural health products claim to boost the immune system, studies have not yet produced any concrete and conclusive findings. Vaccination remains the only truly effective way to strengthen the immune system by preparing its defence against future infections.

For more information, do not hesitate to speak to your pharmacist.

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