6 Best Immune Booster Supplements In 2025 | Tried and Tested

Strengthen your body's defenses against illness and stay healthy all year round. Here are the best supplements with proven immune-boosting potential.

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9 sources

Health Insiders relies on peer-reviewed studies, academic research institutions, and medical associations. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

[1] On the effect of vitamin C intake on human health: How to (mis)interprete the clinical evidence: https://doi.org/10.1016/j.redox.2020.101532

[2] Vitamin D and the Immune System. Journal of Investigative Medicine: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/

[3] Zinc in Human Health and Infectious Diseases: https://doi.org/10.3390/biom12121748

[4] Elderberries—A Source of Bioactive Compounds with Antiviral Action: https://doi.org/10.3390/plants11060740

[5] Antiinflammatory and Immunomodulating Properties of Fungal Metabolites: https://doi.org/10.1155/MI.2005.63

[6] A systematic review on the effects of Echinacea supplementation on cytokine levels: Is there a role in COVID-19? |https://doi.org/10.1016/j.metop.2021.100115

[7] Probiotics Mechanism of Action on Immune Cells and Beneficial Effects on Human Health: https://pmc.ncbi.nlm.nih.gov/articles/PMC9818925/

[8] The immune system: https://pmc.ncbi.nlm.nih.gov/articles/PMC5091071/

[9] Free radicals, antioxidants and functional foods: Impact on human health: https://pmc.ncbi.nlm.nih.gov/articles/PMC3249911/

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