Boosting Your Immune System: What Really Works

The immune system is a complex set of cells, organs, and molecules. Rather than "boosting" it (a marketing term without scientific basis), it's about providing it with optimal operating conditions.

What has Strong Evidence

• Sleep: 7-9 hours per night. Sleep deprivation reduces antibody production after vaccination and increases susceptibility to infections.
• Moderate physical activity: 150 min/week improves immune surveillance. Caution: excessive exercise can temporarily weaken defenses.
• Varied diet: fruits, vegetables, quality protein. Key micronutrients are zinc, iron, selenium, vitamins A, C, D, and E.
• Stress management: chronically elevated cortisol suppresses the immune response.
• Vaccination: the most effective and safest way to prepare the immune system for specific threats.

What has Little (or No) Evidence

• Most "immune-boosting" supplements (echinacea, royal jelly, propolis) lack sufficient quality evidence.
• High-dose vitamin C does not prevent the common cold (it may slightly reduce its duration).
• Probiotics: promising but too variable results for universal recommendations.

A healthy immune system does not need to be "boosted." It needs to be well-nourished, rested, and trained through vaccination.