Ancient tea leaf gains renewed interest for its antiviral properties
Written by Susan Parker | Updated on May 28, 2025
Reviewed by Susan Parker
Key Takeaways
Green tea is packed with polyphenols.
Green tea's EGCG may reduce free radicals.
EGCG in green tea has antiviral effects.
Green tea may help boost immune system.
EGCG supplement ensures higher antioxidant dose.
Follow healthy lifestyle to strengthen immunity.
Seniors need extra vigilance for health.
Harvard Medical School advice on immunity.
Frequently Asked Questions
Key Takeaways
Green tea is packed with polyphenols.
Green tea's EGCG may reduce free radicals.
EGCG in green tea has antiviral effects.
Green tea may help boost immune system.
EGCG supplement ensures higher antioxidant dose.
Follow healthy lifestyle to strengthen immunity.
Seniors need extra vigilance for health.
Harvard Medical School advice on immunity.
Frequently Asked Questions
Previous articles have discussed the various health advantages of tea, with green tea emerging as one of the most beneficial types.
This is due to its high content of polyphenols, which are natural components known to provide numerous health benefits.1
Ongoing research is exploring the potential of green tea in enhancing the immune system's defense against viruses like COVID-19.
Green tea contains a catechin known as epigallocatechin-3-gallate (EGCG), a natural antioxidant. This compound has the ability to reduce free radicals in the body, thereby safeguarding cells and molecules from harm.2
Scientists have long been intrigued by this potent compound, with several studies highlighting its impact on various diseases. EGCG seems to be a key element responsible for green tea's medicinal properties.3
Let's delve deeper into the benefits of EGCG, focusing on its antioxidant, antiviral, and immune-boosting properties.4
Studies indicate that EGCG exhibits antiviral properties against ssRNA viruses such as influenza.
The acronym ssRNA may ring a bell – SARS-COV-2 (commonly known as COVID-19) is also an ssRNA virus. Hence, it's no surprise that contemporary researchers are closely examining this ancient tea leaf.
Recent laboratory experiments suggest that green tea extract could impede and reduce the replication of the COVID-19 virus.5 Researchers observed that EGCG was particularly effective in treating the laboratory cells in the early stages of infection.
However, it's essential to note that this was not a human trial. Furthermore, the green tea extracts used in the study contained a significantly higher EGCG concentration than what is typically found in a cup or two of tea.
While discussions around COVID-19 can be contentious, it is prudent to fortify your immune system against various illnesses. The flavonoids and polyphenols in green tea may contribute to strengthening your immune response.
Moreover, the presence of EGCG in green tea could assist in regulating your body's inflammatory reactions, which can be beneficial for joint discomfort and symptoms associated with different viruses.6
While you can enjoy green tea in abundance, opting for an EGCG supplement ensures a higher intake of this beneficial antioxidant catechin.
Other ways to enhance your immune system include consuming a diet rich in fruits and vegetables with high antioxidant content, regular exercise, maintaining a healthy weight, sufficient sleep, and stress management.
If these suggestions sound familiar, it's because adhering to general health guidelines – as regularly advocated in this newsletter – is deemed the most effective approach by Harvard Medical School to naturally support your immune system's functionality.7
Additionally, it's crucial to recognize that as we age, our immune response diminishes, potentially making us more susceptible to infections. Hence, seniors should be especially diligent in embracing a healthy lifestyle!
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