Flavonoid's Anti-Microbial Properties

palo azul flavonoids vs virus

"Flavonoids proved to be potent antimicrobial inhibitors"

How can palo azul tea help to support your immune system? The answer is simple...flavonoids! Numerous studies have shown that palo azul is rich in flavonoids, and many of its health benefits have actually been attributed to these magical phytonutrients!

2021 study actually found several phytochemicals in palo azul such as flavones, isoflavones, flavanones, phenolic compounds, chalcones and dihydrochalcones” which have been linked to its health benefits, highlighting “diuretic, antidiabetic, antiglycation, antioxidant, anti-inflammatory, antimicrobial potential.”

Flavonoids are phytonutrients that are produced by plants in order to fight bacteria, virus, oxidative stress and inflammation. Thousands of studies have found that they're antioxidant, anti-inflammatory, anti-diabetic, anti-aging, anti-hypertensive, anti-bacterial, anti-viral, anti-mutagenic and anti-carcinogenic.

polyphenols flavonoids family tree

medical review that analyzed the results of 161 studies mentioned that "flavonoids proved to be potent antimicrobial and viral inhibitors." Therefore, they are found to be effective against many infectious diseases (bacterial and viral) such as E. coli.

* Here's an interesting finding“Flavonoids are known to be synthesized by plants in response to microbial infection; thus it should not be surprising that they have been found in vitro to be effective antimicrobial substances against a wide array of microorganisms.” It’s due to their potent antibacterial, antimicrobial and antiviral activity that flavonoids “show inhibitory activity against E. coli."

palo azul herb plants

The researchers mention that "studies have suggested the protective effects of flavonoids against many infectious and degenerative diseases such as cardiovascular diseases, cancers and other age-related diseases."

The researchers concluded the following: “Many researchers have isolated and identified the structures of flavonoids having properties of antifungal, antiviral and antibacterial activity. Because of this property, many flavonoids are now being used extensively in the fields of nutrition, food safety and health.

Flavonoids inhibit several types of microbes

mona lisa drinking palo azul

medical review which analyzed 166 studies mentions that "naturally occurring flavonoids with antiviral activity have been recognized since the 1940s and many reports on the antiviral activity of various flavonoids are available.”

This same medical review also found that “many flavonoids show activity against several types of virus including HSVrespiratory syncytial viruspolio virus and Sindbis virus.” The authors also mentioned that flavonoids “are an important source for the discovery and the development of novel antiviral drugs.”

2020 study found that flavonoids have inhibitory effects against Ebola, herpes, HIV, Influenza and coronaviruses.


palo azul vs coronaviruspalo azul vs hiv viruspalo azul vs influenza viruspalo azul vs herpes ebola

2020 study explains the biological mechanisms by which flavonoids can block entry of viruses into cells:  

“Flavonoids block attachment and entry of viruses into cells, interfere with various stages of viral replication processes or translation and polyprotein processing to prevent the release of the viruses to infect other cells. These biomolecules (flavonoids) can act at different stages of viral infection, particularly at the molecular level to inhibit viral growth.” 

flavonoids antiviral

This medical review elaborates further on the specific mechanisms for flavonoids anti-viral activity: 

Inhibition of viral polymerase and binding of viral nucleic acid or viral capsid proteins have been proposed as antiviral mechanisms of action.”

Viral polymerases play a central role in viral genome replication and transcription.

Binding of viral nucleic acid is an anti-viral effect which interferes with viral polymerases. 

Capsid proteins are protein shells that surround and protect the viral genome.

In other words...flavonoids could potentially inhibit the replication of virus by binding onto them and interfering their protective shells. 


1. Coronavirus


The researchers found that "a flavonoid derivative, luteolin, was found to interfere with the entry of influenza A virus and severe acute respiratory syndrome coronavirus (SARS-CoV) by interacting with the hemagglutinins of influenza A virus and the S2 protein of SARS-CoV viruses."

In addition, the scientists reported "that another flavonoid derivative, kaempferol, also inhibited coronavirus channel 3a and blocked the release of the virus' progeny."

The way that coronaviruses attack our bodies is that they use the DNA in our cells to send out RNA signals that replicate the virus. The researchers explain how it works:

"Plant flavonoids serve as a vast reservoir of therapeutically active compounds that have been explored as potential antiviral candidates against RNA and DNA viruses. RNA and DNA viruses attach to our own cells and send RNA signals across our cell membranes to replicate."

In other words, RNA and DNA viruses use our own cells to multiply and attack our bodies. 

2. HIV

hiv virus

The 2020 study found that “sulfated rutin (flavonoid derivative) was shown to block the entry of human immunodeficiency virus (HIV)-1.” The researchers concluded that “sulfated rutin could drastically inhibit HIV-1 infection.”

Moreover, they found that “flavonoids were reported to inhibit assembly and release of HIV and influenza A virus, respectively.”

3. Influenza

influenza virus flu

The researchers from this study found that “tea catechins (flavonoids) were also reported to inhibit the influenza A virus by binding to the hemagglutinins and restricted virus adsorption, preventing the penetration of the virus into the cells.”

Moreover, another flavonoid derivitave, quercetins, were “found to inhibit the initial stage of viral replication of the influenza A virus, evident by a decrease in mRNA synthesis of the virus.”

A group of flavonoids was also reported to "inhibit early replication of influenza A virus by reduction of sialidase activity, inhibition of lysosomal fusion and RNA polymerase activity."

4. Herpes and Ebola

herpes virus

The 2020 study found that quercetin “blocked viral binding and entry of herpes simplex virus (HSV)-1.”

Moreover, they found that “another flavonoid derivative, 3-β-O-d-glucoside, was able to protect mice from Ebola virus infection when given prior to virus challenge.”


In summary, palo azul tea may help to support the immune system because it's rich in flavonoids. Some flavonoid derivatives have shown the ability to inhibit certain microbes and because of this, studies suggest that they may be a source for the development of anti-microbial drugs. 


magiktea palo azul logo

Interfere microbial replication...
and inhibit those polymerases! 😉



Clinical Studies

* Palo azul is commonly referred to by its scientific name: Eysenhardtia polystachya / E. polystachya / E.P - Cyclolepis genistoides / C. genistoides - kidney wood - palo dulce


(2021) Screening Anti-Inflammatory Effects of Flavanones Solutions

(Oct, 2018) Pharmacological and toxicological study of a chemical-standardized ethanol extract of the branches and leaves from Eysenhardtia polystachya (Ortega) Sarg. (Fabaceae)

(June 14, 2012) Ethnobotanical survey and antibacterial activity of plants used in the Altiplane region of Mexico for the treatment of oral cavity infections

(2009) Chapter 18 -  Flavonoids and Cardiovascular Health


(2016, Dec 29) (Medical Review: 161 studies) Flavonoids: an overview

(2013, Dec 29) (Medical review: 166 studies) Chemistry and Biological Activities of Flavonoids: An Overview 

(2003) Lupin 

(2020) Flavonoids as Antiviral Agents for Enterovirus A71 (EV-A71)