Quercetin has been shown to combat inflammation and acts as a natural antihistamine. Several studies have highlighted quercetin’s ability to prevent and treat both the common cold and influenza.
Other, less-known benefits and uses for quercetin include the prevention and/or treatment of high blood pressure, cardiovascular disease, metabolic syndrome, certain cancers, gout, arthritis and mood disorders.
A review of quercetin’s effect on metabolic syndrome found it significantly reduced fasting plasma glucose when taken for at least eight weeks at a dosage of 500 milligrams per day or more.
Other recent research found quercetin has a beneficial impact on non-alcoholic fatty liver disease by ameliorating inflammation, oxidative stress and lipid metabolism.
Quercetin also has the ability to trigger tumour regression by interacting with your DNA and activating the mitochondrial pathway of apoptosis (the programmed cell death of damaged cells).
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Quercetin1 is an antioxidant flavonol found naturally in foods such as apples, plums, red grapes, green tea, elder flower and onions, just to name a few.2 According to a 2022 LinkedIn report,3 the quercetin market is growing rapidly as its health benefits are becoming more widely known, with a projected global market of $406 million by 2027.
Quercetin has been shown to combat inflammation and acts as a natural antihistamine. In fact, its antiviral capacity appears to be the primary focus of many studies looking at quercetin’s benefits, and several studies have highlighted quercetin’s ability to prevent and treat both the common cold and influenza.4,5,6
But there are also other, less-known benefits and uses for this supplement, including the prevention and/or treatment of:7
|High blood pressure8||Cardiovascular disease9|
|Metabolic syndrome10||Certain kinds of cancer11|
|Non-alcoholic fatty liver disease (NAFLD)12||Gout13|
|Longevity, thanks to its senolytic benefits (clearing out damaged and worn-out cells)16,17|
Additionally, quercetin is also helpful for aluminium-induced neurodegenerative changes, such as those seen in Alzheimer’s, Parkinson’s and amyotrophic lateral sclerosis (“ALS”). As noted in a 2016 study:18
Administration of quercetin (10 mg/kg body wt/day) reduced aluminium (10 mg/kg body wt/day)-induced oxidative stress (decreased ROS production, increased mitochondrial superoxide dismutase (MnSOD) activity).
In addition, quercetin also prevents aluminium-induced translocation of cyt-c, and up-regulates Bcl-2, down-regulates Bax, p53, caspase-3 activation and reduces DNA fragmentation …
Further electron microscopic studies revealed that quercetin attenuates aluminium-induced mitochondrial swelling, loss of cristae and chromatin condensation. These results indicate that treatment with quercetin may represent a therapeutic strategy to attenuate the neuronal death against aluminium-induced neurodegeneration.
Quercetin Improves Metabolic Syndrome Traits
Among the most recent papers on this powerful antioxidant is a review19 published in the March 2019 issue of Phytotherapy Research, which looked at nine randomised controlled trials investigating quercetin’s effect on metabolic syndrome.
Metabolic syndrome refers to a cluster of conditions (including high blood pressure, high blood sugar, high triglyceride levels and fat accumulation around the waist) that raise your risk for Type 2 diabetes, heart disease and stroke.
While pooled findings found no effect on fasting plasma glucose, insulin resistance or haemoglobin A1c levels, further subgroup analyses revealed quercetin supplementation “significantly reduced” fasting plasma glucose in studies lasting at least eight weeks and in which dosages of at least 500 milligrams (mg) per day were used.
In studies that included people over the age of 45, “significant” reductions in insulin were also found when using a dosage of 500 mg per day or more. An earlier study,20 published in 2011, looked at quercetin’s effects on certain traits of metabolic syndrome.
This study focused specifically on atherosclerosis and inflammation in men with the APOE genotype 3/3, 3/4 and 4/4, and found quercetin significantly decreased waist circumference, postprandial systolic blood pressure, postprandial triacylglycerol, and increased HDL-cholesterol compared to placebo. Here, participants were given 150 mg of quercetin per day for eight weeks.
Research21 on obese rats published in 2008 also found that quercetin supplementation at doses of 2 mg per kilo or 10 mg/kg of body weight for 10 weeks improved systolic blood pressure, triglyceride, total cholesterol and free fatty acid levels. The 10 mg/kg dose also improved the animals’ inflammation status. As noted by the authors:
In conclusion, both doses of quercetin improved dyslipidemia, hypertension, and hyperinsulinemia in obese Zucker rats, but only the high dose produced anti-inflammatory effects in VAT together with a reduction in body weight gain.
One of the first studies22 to demonstrate quercetin’s beneficial effects on blood pressure was published in 2007. As reported by the authors:
Epidemiological studies report that quercetin … is associated with reduced risk of coronary heart disease and stroke … Men and women with prehypertension and stage 1 hypertension were enrolled in a randomised, double-blind, placebo-controlled, crossover study to test the efficacy of 730 mg quercetin/d for 28 d[ays] vs. placebo.
Blood pressure at enrolment was … 148 +/- 2/96 +/- 1 in stage 1 hypertensive subjects … Reductions in systolic (-7 +/- 2 mm Hg), diastolic (-5 +/- 2 mm Hg), and mean arterial pressures (-5 +/- 2 mm Hg) were observed in stage 1 hypertensive patients after quercetin treatment … These data are the first to our knowledge to show that quercetin supplementation reduces blood pressure in hypertensive subjects.
Similarly, a January 2020 systematic review23 of 17 studies concluded quercetin “significantly decreased” blood pressure in human subjects. Those who took it for eight weeks or more also had “significantly” improved high-density lipoprotein cholesterol and triglycerides.
Quercetin Improves Diabetes-Induced NAFLD
Other recent research24 published in the August 2019 issue of Phytotherapy Research concluded quercetin has a beneficial impact on NAFLD “by ameliorating inflammation, oxidative stress and lipid metabolism.”
Diabetes can play a role in NAFLD as well, showing just how influential insulin resistance is in the development of chronic diseases of all kinds. As explained in the abstract:
Multiphase pathological processes involved in Type 2 diabetes (T2DM)‐induced non-alcoholic fatty liver disease (NAFLD). However, the therapies are quite limited. In the present study, the hepatoprotective effects and underlying mechanisms of quercetin in T2DM‐induced NAFLD were investigated …
The results revealed that quercetin alleviated serum transaminase levels and markedly reduced T2DM‐induced histological alterations of livers. Additionally, quercetin restored superoxide dismutase, catalase, and glutathione content in livers.
Not only that, quercetin markedly attenuated T2DM‐induced production of interleukin 1 beta, interleukin 6, and TNF‐α. Accompanied by the restoration of the increased serum total bile acid and the decreased liver total bile acid, quercetin could reduce lipid accumulation in the liver … These findings suggested that quercetin might be a potentially effective drug for the treatment of T2DM‐induced NAFLD.
Quercetin Helps Modulate Gene Expression
According to research25 published in 2016, quercetin even has the ability to trigger tumour regression by interacting with your DNA and activating the mitochondrial pathway of apoptosis (the programmed cell death of damaged cells).
Quercetin was found to induce cytotoxicity in leukemic cells, and the effect was dose-dependent. Limited cytotoxic effects were also found in breast cancer cells. Overall, quercetin increased the life span in cancer-ridden mice fivefold compared to untreated controls.
The authors attributed these effects to quercetin’s direct interaction with DNA and its activation of the mitochondrial pathway of apoptosis and suggested quercetin’s potential use as a cancer therapy adjunct deserves further exploration.
More recent research26 in the journal Molecules also highlights quercetin’s epigenetic influence and ability to:
- Interact with cell-signalling pathways
- Modulate gene expression
- Influence the activity of transcription factors
- Modulate microRNAs
MicroRNAs used to be considered “junk” DNA. Far from being useless, research has now revealed that “junk” DNA is actually microRNA and plays a crucial role in regulating genes that make the proteins that build your body.
The microRNA function as “on/off” switches for the genes. Depending on the microRNA input, a single gene can code for any of more than 200 protein products. Quercetin’s ability to module microRNA may also help explain its cytotoxic effects, and why it appears to improve cancer survival (at least in mice).
Quercetin Is a Powerful Antiviral
As mentioned, one of the most well-studied attributes of quercetin is its antiviral capacity, which has been attributed to three main mechanisms of action:
- Inhibiting the virus’ ability to infect cells
- Inhibiting replication of already infected cells
- Reducing infected cells’ resistance to treatment with antiviral medication
For example, research27 published in 2007 found it lowered cyclists’ risk of upper respiratory tract infections following intensified exercise.
Here, cyclists who received a daily dose of 1,000 mg of quercetin in combination with vitamin C (which enhances plasma quercetin levels28,29) and niacin (to improve absorption) for five weeks were significantly less likely to contract a viral illness after bicycling three hours a day for three consecutive days, compared to untreated controls. While 45% of the placebo group got sick, only 5% of the treatment group did.
In another study30 funded by the US Defence Advanced Research Projects Agency (“DARPA”), published in 2008, animals treated with quercetin were challenged with a highly pathogenic H1N1 influenza virus. Again, the treatment group had significantly lower morbidity and mortality than the placebo group. Several other studies have also confirmed quercetin’s effectiveness against a variety of viruses, including the following:
|A 1985 study found quercetin inhibits infectivity and replication of herpes simplex virus type 1, poliovirus type 1, parainfluenza virus type 3 and respiratory syncytial virus.31|
|A 2010 animal study found that quercetin inhibits both influenza A and B viruses. Two other important discoveries were made. Firstly, the viruses were unable to develop resistance to quercetin, and secondly, when used concomitant with antiviral drugs (amantadine or oseltamivir), the effect was significantly amplified — and it prevented drug resistance from developing.32|
|A 2004 animal study investigating quercetin’s effect on influenza used a strain of the H3N2 virus. According to the authors:33 |
“During influenza virus infection, there is ‘oxidative stress.’ Because quercetin restored the concentrations of many antioxidants, it is proposed that it may be useful as a drug in protecting the lung from the deleterious effects of oxygen-derived free radicals released during influenza virus infection.”
|Another 2016 study found quercetin offered protection against influenza A virus H1N1 by modulating protein expression. More specifically, the regulation of heat shock proteins, fibronectin 1 and prohibitin was instrumental in reducing viral replication.34|
|A third study published in 2016 found quercetin inhibited a wide spectrum of influenza strains, including H1N1, H3N2 and H5N1. According to the authors: |
“This study indicates that quercetin showing inhibitory activity in the early stage of influenza infection provides a future therapeutic option to develop effective, safe and affordable natural products for the treatment and prophylaxis of [influenza A viruses] infections.”35
|In 2014, researchers noted that quercetin appears to be “a promising treatment for the common cold,” caused by the rhinovirus, adding that “Quercetin has been shown to reduce viral internalisation and replication in vitro, and viral load, lung inflammation and airways hyper-responsiveness in vivo.”36 |
By attenuating oxidative damage, it also lowers your risk of secondary bacterial infections, which is actually the primary cause of influenza-related deaths. Importantly, quercetin increases mitochondrial biogenesis in skeletal muscle, which suggests part of its antiviral effects are due to enhanced mitochondrial antiviral signalling.
|A 2016 animal study37 found quercetin inhibited mouse dengue virus and hepatitis virus. Other studies have confirmed quercetin’s power to inhibit both hepatitis B38 and C39 infection.|
|Most recently, a March 2020 study40 in the Microbial Pathogenesis journal found quercetin “provides comprehensive protection against Streptococcus pneumoniae infection,” both in vitro and in vivo, primarily by neutralising pneumolysin (PLY),41 one of the toxins released from pneumococci that encourages S. pneumoniae infection to blossom in the first place. As reported by the authors in Microbial Pathogenesis: |
“The results indicated that quercetin significantly reduced PLY-induced haemolytic activity and cytotoxicity via repressing the formation of oligomers.
“In addition, treatment with quercetin can reduce PLY-mediated cell injury, improve the survival rate of mice infected with a lethal dose of S. pneumoniae, alleviate the pathological damage of lung tissue and inhibit the release of cytokines (IL-1β and TNF-α) in bronchoalveolar lavage fluid.
“Considering the importance of these events in antimicrobial-resistant S. pneumoniae pathogenesis, our results indicated that quercetin may be a novel potential drug candidate for the treatment of clinical pneumococcal infections.”
Quercetin Combats Inflammation and Boosts Immunity
Aside from its antiviral activity, quercetin is also known for boosting immunity and combating inflammation. As noted in a 2016 study42 in the journal Nutrients, mechanisms of action include (but are not limited to) the inhibition of:43
- Lipopolysaccharide (LPS)-induced tumour necrosis factor α (TNF-α) production in macrophages. TNF-α is a cytokine involved in systemic inflammation, secreted by activated macrophages, a type of immune cell that digests foreign substances, microbes and other harmful or damaged components
- LPS-induced mRNA levels of TNF-α and interleukin (IL)-1α in glial cells, which results in “diminished apoptotic neuronal cell death”
- The production of inflammation-producing enzymes
- Calcium influx into the cell, which in turn inhibits: Pro-inflammatory cytokine release and histamine and serotonin release from intestinal mast cells release44
According to this paper, quercetin also stabilises mast cells, has cytoprotective activity in the gastrointestinal tract, and “a direct regulatory effect on basic functional properties of immune cells,” which allows it to inhibit “a huge panoply of molecular targets in the micromolar concentration range, either by down-regulating or suppressing many inflammatory pathways and functions.”45
Quercetin May Be a Useful Supplement for Many
Considering its wide-ranging benefits, quercetin may be a useful supplement for many, either acutely or more long-term. It is one of the supplements I recommend keeping in your medicine chest for times when you feel you’re “coming down” with something, be it the common cold or influenza.
If you’re prone to colds and flu, you could consider taking it for a couple of months before cold and flu season hits to boost your immune system. More long-term, it appears useful for those with metabolic syndrome, although it would be foolish to rely on any given supplement without also addressing more fundamental strategies such as diet and exercise.
As explained in my 2015 interview with Dr. Robert Lustig, sugar has been shown to be a causative factor in insulin resistance, which is a hallmark of metabolic syndrome and a risk factor for virtually all chronic diseases.
If you have one or more of the conditions that make up metabolic syndrome, you’d be wise to limit your total sugar consumption to 15 grams per day. If you’re healthy and want to stay that way, your daily sugar limit would be around 25 grams.
Sources and References
- 1, 15 Fitoterapia 2015 Oct;106:256-71
- 2 Superfoodly, 100 Quercetin Foods
- 3 LinkedIn. Quercetin Raw Material Supply in Q4 of 2022 September 6, 2022
- 4 Antiviral Research, Volume 94, Issue 3 June 2012, Pages 258-271
- 5 Viruses 2016 8(1), 6
- 6 European Journal of Pharmaceutical Sciences Volume 37, Issues 3-4 28 June 2009, Pages 329-333
- 7 Genetic Lifehacks December 17, 2019
- 8 J Am Heart Assoc. 2016 Jul 12;5(7). pii: e002713
- 9 Int J Mol Sci. 2019 Dec 3;20(23). pii: E6093
- 10, 19 Phytotherapy Research March 8, 2019; 33(5)
- 11, 25 Scientific Reports April 12, 2016; 6 Article Number: 24049
- 12, 24 Phytotherapy Research August 26, 2019 DOI: 10.1002/ptr.6486
- 13 Br J Nutr. 2016 Mar 14;115(5):800-6
- 14 J Am Coll Nutr. 2017 Jan;36(1):9-15
- 16 EBioMedicine. 2019 Sep;47:446-456
- 17 BMB Rep. 2019;52(1):47–55
- 18 Neuroscience 2016 Jun 2;324:163-76
- 20 Nutrition, Metabolism & Cardiovascular Diseases 2013; 23: 403-409 (PDF)
- 21 Obesity (Silver Spring). 2008 Sep;16(9):2081-7
- 22 Journal of Nutrition 2007 Nov;137(11):2405-11
- 23 Nutrition Reviews January 6, 2020 DOI: 10.1093/nutrit/nuz071
- 26 Molecules 2019 Dec 23;25(1). pii: E63
- 27 Academia. 2007
- 28 Journal of the American Dietetic Association 2011 Apr;111(4):542-9
- 29, 36 Journal of Infectious Diseases and Preventive Medicine May 24, 2014; 2: 111
- 30 American Journal of Physiology August 1, 2008
- 31 Journal of Medical Virology January 1985 DOI: 10.1002/jmv.1890150110
- 32 Antiviral Research 2010 Nov;88(2):227-35
- 33 Experimental Lung Research 2005; 31(5)
- 34 Journal of Agricultural and Food Chemistry 2016; 64(21): 4416-4425
- 35 Viruses 2016 Jan; 8(1): 6
- 37 Asian Pacific Journal of Tropical Medicine January 2016; 9(1): 1-7
- 38 Virologica Sinica August 2015; 30(4): 261-268
- 39 Hepatology 2009 Dec;50(6):1756-64
- 40 Microbial Pathogenesis March 2020; 140: 103934
- 41 Clinical & Experimental Immunology November 2004; 138(2): 195-201
- 42 Nutrients 2016 Mar; 8(3): 167, 5.2.1 Animal Models
- 43, 45 Nutrients 2016 Mar; 8(3): 167, 5.1.2 Mechanism of Action
- 44 Nutrients 2016 Mar; 8(3): 167, Table 1: Mast cell
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We have used quercetin for decades as a daily supplement. We no longer get the yearly flu & avoided the covid. It has reduced my asthma symptoms so they have been completely managed by a single daily medication.
IT IS A GIFT MADE IN HEAVEN …”Quercetin is a plant pigment (flavonoid). It’s found in many plants and foods, such as red wine, onions, green tea, apples, and berries.”
and Jesus promotes it as he changed water into red wine….
Sorry, I can’t see the proof how quercetin fights off the effect of radiation multiplied in the body of the vaxxed due to graphene. How?
Are you lot just spoiling for a fight or what ??? … I never stated it did sweet FA as I had never heard of it before today.
You must be a Yank or Canadian (or dumb) as you do not get sarcasm, humour or satire.
Get out of here.
Very funny but you missed to explain it.
No seriously… in big letters now .. I HAD NEVER HEARD OF IT, BEFORE THIS ARTICLE.
As for you comment “Sorry, I can’t see the proof how quercetin fights off the effect of radiation multiplied in the body of the vaxxed due to graphene. How?” … … regards the graphene oxide – at the risk of sounding crude, it may make you have a number 2 more often and flush it out (before you go on, why do they want people to have the boosters … the immunity levels hahahaha) BUT if “Radiation” was mentioned in the article; it is both illogical and nonsense … the same nonsense as these internet “alt-media” fools selling iodine tablets (JUST MY VIEW BY THE WAY -NO OFFENSE TO OTHERS).
I had a fraction of the percentage of the dose of the radiation levels we are talking about with cancer … it gets you from the outside and inside and no purple pill is going to help; you are literally fried.
I suffered for 25 years from asthma until I realized that breathing through my mouth after coming down with a bad cold was causing it. I took a lot of Vitamin C, hot drinks, and kept my nose open with nose drops. Been free from asthma for the past 25 years. Just saw in Dr. Kendrick’s Clotting Factor the reason why it helps – the nasal passages produce nitric oxide which has anti-bacterial and anti-viral capacity, which the body then breathes in to the lungs. NO has many other vital uses in the body and immune system.
Comment deleted – why ?
The bible states that Jesus turned water into wine (red wine back then).
and Quercetin is a plant pigment (flavonoid). It’s found in many plants and foods, such as red wine, onions, green tea, apples, and berries.
Do you think real Christians would be offended by my comment ??
Hi Bob, your comment was flagged as waiting for approval. I’m not sure why. But since both comments with the link you shared were treated the same, we could guess that was the issue?
No worries, my apologies – bad day at the office, so to speak. Right, have a good weekend.
Sorry you had a bad day. Have a good weekend.
I feel for you. It was about 20 yrs or so I stood on my own feet and have no boss. That was exactly the time I realized that if you work hard for others (money) you have no time for real education or simply just think about things freely.
The effect of being short of time is visible Rob.
Cool and thanks I think, but who is Rob ?.
I’m a Christian & Im not offended
Thanks but you jolly well should be; no idea why; but it’s Friday night !!.
Have a good weekend.
During the Covid madness I used Artemisia Annua. Saved my unvaccinated 92 year old mom in January 2022.
I used nothing because I knew it was a hoax.
Yeah… viruses don’t exist and all illnesses are imaginary.
Quercetin also works great along with NAC (Cysteine, an amino acid) in preventing all Coronavirus’ for me since 2009. No shots either! I have taken only Swanson Vitamins’ 600 mg NAC. capsules. Now about $10.00 a bottle. Child: 1/Day Adult: 2/Day
Those already jabbed should take these, too. Everyone should now.
STAY ALIVE AND WELL NATURALLY! I post publicly on MeWe.
ETERNAL LIFE BLESSINGS FOR YAHWEH’S SAINTS!
Sorry but it doesn’t prevent any non existent corona virus, its working mechanism is that NAC is a glutathione precursor. Meant to fight off POISONING but non existent viruses. Children were less affected because the guttation reserve in the liver is higher but with age it becomes less and less.
Please put time into reading but only commenting.
Enough already! I HAVE put time into reading and research.
NAC does a whole lot more for our bodies. GERMS AND VIRUS’ EXIST ABUNDANTLY! WAKE UP! You just better hope and pray that one does NOT catch YOU!
[…] Quercetin Health Benefits include the Treatment of Cardiovascular Disease and Certain Cancers […]
I take 400mg Every Day & have been since early 2020
And I take none as supplement and still here kicking, There was a couple of psyop ruining your health. To make it short, the key of good circulation and healthy arteries is ANIMAL FAT, the key for healthy cells is quality water and far more salt they advise, the key for good calcium level is RAW milk products and so on.
Can you please explain the mechanism that how exactly quercetin fights against radiation damage, nanotech, graphene, and eliminates nano routers giving us MAC adress? Thank you.
You’re still into the MAC hoax ?
[…] – Quercetin Health Benefits include the Treatment of Cardiovascular Disease and Certain Cancers […]
Sorry if I sound so negative but I was taking quercetin for a while but still got a mild case of covid (like the first time) A-c still a little high, and other symptoms this drug is suppose to help. Stopped taking it for now. I have to wonder if you are one of the producers of this drug. Most of the time people pushing a drug have a money investment in the company. Sorry
Hi Barbara, we are a free to read media outlet that relies solely on donations from our readers. We don’t advertise, market or sell any products or services nor do we have any affiliations with any drug or any other commerical enterprises. Because they cannot cut off the source of our funds they resort to tactics such as described in the article below to try to control what we publish or to try to shut us down:
The quercetin manufactures and scientist have not pledged that taking it would ensure prevention. Interesting that covid vaccines are supposed to prevent and stop the transmission of a virus. The Covid jabs don’t work. The CDC and the NIH has gotten it wrong… what do they do… They change the definition of ‘vaccine’. The scientists did the same with global warming and changing it to climate change. All I can say is that I have had great results with Quercetin.
“Quercetin has been shown to combat inflammation and acts as a natural antihistamine” as By Dr. Joseph Mercola. I am not an anti-vaxxer but when you can’t sue the manufactureres for a vaccine I looked for alternative sources. I also have asthma. I have been taking Quercetin along with: vitamin D3,Zinc, copper, NAC, C, and added a CBD…taken daily. All I can say is that I have been taking asthma daily meds for 40 years. Today I can say that it has been 3 months and 13 days that I have not touched any asthma meds of daily nor any resque inhalers. What works for me may not work for you. Glad to say that Quercetin works for me.