2 New Studies Test Quercetin and COVID-19 Outcomes

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Studies suggest this antiviral, anti-blood clotting, anti-inflammatory is an effectual therapeutic

Since the opening of the COVID-19 pandemic, bully doctors person done what bully doctors bash and person fixed their patients harmless and effectual therapeutics to dainty COVID-19.

While nationalist wellness officials said thing could beryllium done, galore doctors applied lessons learned from erstwhile viral infections and helped their patients enactment their immune systems with harmless measures that person a known history.

Common measures suggested by those doctors person included the usage of vitamin D and antioxidants. As the pandemic wears on, mounting grounds points to the efficacy of galore of these treatments, including quercetin.

Quercetin is simply a works flavonol, a potent antioxidant recovered successful galore fruits, vegetables, seeds, and leaves. It’s safe, inexpensive, casual to obtain, and tin assistance zinc get wrong your cells, wherever it tin enactment to halt viral replication.

Statistical Improvement successful Clinical Outcomes

Two caller studies item the imaginable this harmless plant-derived antioxidant has to dainty COVID-19.

In the first study, published successful the International Journal of General Medicine, 42 COVID-19 outpatients were divided into 2 groups. One radical of 21 patients received modular aesculapian therapy consisting of painkillers (acetaminophen) and an antibiotic for 3 consecutive days. The different 21 patients received modular therapy, positive the equivalent of 600 mg of quercetin per time (divided into 3 doses) for 7 days, followed by different seven-day people of 400 mg of quercetin per time (divided into 2 doses).

The quercetin was utilized with sunflower lecithin, which has been demonstrated to summation absorption successful the gut by arsenic overmuch arsenic 20 times, compared to axenic quercetin formulations.

The main outcomes being evaluated were microorganism clearance and symptoms. After 1 week of treatment, 16 of the 21 patients successful the quercetin radical tested antagonistic for SARS-CoV-2 and 12 reported that each of their symptoms had diminished.

In the modular attraction group, lone 2 patients tested antagonistic and 4 reported partially improved symptoms. By the extremity of week two, the 5 remaining patients successful the quercetin radical tested negative. In the modular attraction group, 17 of the 19 remaining patients tested antagonistic and 1 had died.

“These results are impressive, and hopefully further studies volition beryllium conducted connected hospitalized patients to spot however quercetin mightiness beryllium adjuvant successful much terrible cases,” Dr. Michael Murray wrote successful an Aug. 21 newsletter.

Can Quercetin Reduce Hospitalizations and Deaths?

The second study—a prospective, randomized, and controlled open-label trial—gave 152 COVID-19 outpatients a regular dose of 1,000 mg of quercetin for 30 days to measure its adjuvant effects successful the attraction of aboriginal COVID-19 symptoms and the prevention of terrible infection.

“The results revealed a simplification successful frequence and magnitude of hospitalization, successful request of non-invasive oxygen therapy, successful progression to intensive attraction units and successful a fig of deaths,” the survey authors wrote.

“The results besides confirmed the precise precocious information illustration of quercetin and suggested imaginable anti-fatigue and pro-appetite properties.”

They described the branded signifier of quercetin being tested (Quercetin Phytosome) arsenic “a harmless cause and successful operation with modular care, erstwhile utilized successful aboriginal signifier of viral infection,” saying that it could amended aboriginal symptoms and forestall terrible COVID-19.

Mechanisms of Action

The authors of the archetypal survey wrote that they chose quercetin due to the fact that it has antiviral, anti-blood clotting, anti-inflammatory, and antioxidant properties, each of which are important successful the attraction of SARS-CoV-2 infection. In the 2nd study, much elaborate mechanisms of enactment are reviewed.

The authors looked astatine specific enzymes with the assistance of molecular docking studies, gaining penetration into the intricate biochemistry astatine play.

“Quercetin is characterized by 3 important properties: antioxidant, anti-inflammatory and immunomodulatory. The operation of these actions allows quercetin to beryllium a imaginable campaigner to enactment each unhealthy conditions wherever oxidative stress, inflammation and immunity are involved,” they wrote.

Initially, quercetin gained attraction due to the fact that it’s a zinc ionophore, meaning it shuttles zinc—which has well-known antiviral effects—into your cells conscionable similar the cause hydroxychloroquine.

Some projected that the superior crushed hydroxychloroquine and quercetin worked was due to the fact that of this feature. Of course, you besides had to instrumentality zinc on with either of them. To efficaciously enactment arsenic a zinc ionophore, quercetin besides needs vitamin C.

Since then, different studies, including the 2 reviewed successful this article, person shown that quercetin has different actions that marque it utile against SARS-CoV-2 arsenic well. As reported by Murray successful his newsletter:

“In particular, quercetin exerts important inhibition connected the binding of circumstantial spike proteins to ACE-2 receptors, thereby blocking the quality of the microorganism to infect quality cells. Quercetin has besides been shown to straight neutralize viral proteins that are captious successful the replication of SARS-CoV-2.”

In immoderate studies, quercetin has besides been shown to inhibit the merchandise of inflammatory cytokines, signaling molecules that summon immune cells to combat disconnected invaders. Unfortunately, successful COVID-19, excessively galore cytokines nonstop up a awesome and the immune effect turns deadly. Dampening the cytokine awesome could assistance alleviate infection-related symptoms and suppress excessive inflammatory responses from occurring. Quercetin’s antioxidant effects may besides assistance forestall insubstantial damage caused by scavenging escaped radicals, thereby aiding successful the betterment process of viral infections.

Quercetin’s Antiviral Properties

Quercetin’s antiviral properties person been attributed to 3 main mechanisms of action: inhibiting the virus’ quality to infect cells; inhibiting replication of already infected cells; and reducing infected cells’ absorption to attraction with antiviral medication.

Research connected mice funded by the U.S. Defense Advanced Research Projects Agency and published successful 2008 recovered that quercetin lowers your hazard of viral illnesses specified arsenic influenza and boosts intelligence show pursuing utmost carnal stress, which mightiness different undermine your immune relation and render you much susceptible to infections.

Another survey looked astatine cyclists who received a regular dose of 1,000 mg of quercetin successful operation with vitamin C (which enhances plasma quercetin levels) and the B vitamin niacin (to amended absorption) for 5 weeks. Those successful the attraction radical were importantly little apt to declaration a viral unwellness aft bicycling 3 hours per time for 3 consecutive days, compared to untreated controls. While 45 percent of the placebo radical yet got sick, that fig was astatine conscionable 5 percent of the attraction group.

Quercetin Works Against Many Common Viruses

Before the COVID-19 pandemic struck, respective studies had highlighted quercetin’s ability to prevent and treat the common cold (which is often caused by a coronavirus) and seasonal influenza. By attenuating oxidative damage, quercetin besides lowers your hazard of secondary bacterial infections, which is really the superior origin of influenza-related deaths.

Importantly, quercetin increases the maturation successful size and fig of mitochondria (the powerhouse of a cell) successful skeletal muscle, which suggests portion of its antiviral effects are owed to enhanced mitochondrial antiviral signaling. Quercetin has besides been recovered to enactment against different viruses arsenic well.

A 1985 study recovered that quercetin inhibits the infectivity and replication of herpes simplex microorganism benignant 1, polio-virus benignant 1, parainfluenza microorganism benignant 3, and respiratory syncytial microorganism (RSV).

A 2016 carnal study recovered that quercetin inhibited rodent dengue microorganism and the hepatitis virus.

Other studies person confirmed quercetin’s powerfulness to inhibit some hepatitis and hepatitis C infections.

A March 2020 study recovered that quercetin provides “comprehensive protection” against Streptococcus pneumoniae infection. As reported by the authors of this study: “Our results indicated that quercetin whitethorn beryllium a caller imaginable cause campaigner for the attraction of objective pneumococcal infections.”

How Quercetin Combats Inflammation and Boosts Immunity

Aside from its antiviral activity, quercetin is besides known for boosting immunity and combating inflammation. A 2016 study successful the diary Nutrients describes the mechanisms of action, which included inhibiting a cytokine progressive successful systemic inflammation, dampening the accumulation of inflammation-producing enzymes, and curbing different inflammatory agents.

According to the study, quercetin also stabilizes mast cells, has cytoprotective enactment successful the gastrointestinal tract, and has “a nonstop regulatory effect connected basal functional properties of immune cells,” which allows it to inhibit “many inflammatory pathways and functions.”


While quercetin does person potent antiviral effects, successful bid for it to enactment effectively, you request sufficiently precocious dosages to rise the level of quercetin successful your body’s tissues. The comparatively debased absorption complaint of quercetin is wherefore a sunflower lecithin formulation was used.

Research published successful the July–December contented of the Journal of Natural Health Products Research, recovered that a quercetin matrix has the aforesaid full absorption complaint arsenic quercetin phytosome—and higher highest humor levels.

“Since some of these forms of quercetin nutrient akin humor levels, they should nutrient the aforesaid effects astatine adjacent dosages based upon quercetin content,” Murray wrote successful his newsletter.

“My dosage proposal arsenic portion of a nutritional supplement programme to enactment immune relation is 250 mg doubly daily.

“And successful patients with progressive infection, my proposal is … six capsules doubly a time providing a full of 3,000 mg of quercetin. This precocious dosage should beryllium taken for astatine slightest 10 days and past reduced to a attraction dosage of 250 mg doubly daily.

[This] precocious dosage whitethorn not beryllium necessary. But my dosage calculations are based upon apt insubstantial concentrations needed to exert the strongest antiviral effects. And fixed the information of quercetin, determination is nary harm astatine this level.”

Protocol Using Quercetin

One doc who brought quercetin into the limelight aboriginal was Dr. Vladimir Zelenko. As hydroxychloroquine became hard to obtain, Zelenko switched to recommending quercetin instead, arsenic it’s readily disposable arsenic an over-the-counter supplement. For a downloadable “cheat sheet” of Zelenko’s protocol for COVID-19, sojourn VladimirZelenkoMD.com.

Joseph Mercola


Dr. Joseph Mercola is the laminitis of Mercola.com. An osteopathic physician, best-selling author, and recipient of aggregate awards successful the tract of earthy health, his superior imaginativeness is to alteration the modern wellness paradigm by providing radical with a invaluable assets to assistance them instrumentality power of their health. This nonfiction was primitively published connected Mercola.com