Beat the common cold

Al Sears, MD
11905 Southern Blvd.
Royal Palm Beach, FL 33411
April 8, 2020
Reader,

Researchers in Canada and China are testing a powerful immune booster that provides broad-spectrum protection against a number of viruses including SARS, Ebola and H1N1.

They’re currently running clinical trials to prove its effectiveness against coronavirus.

I’m talking about quercetin – a powerful antioxidant that is already available as a supplement.

Previous research shows that quercetin’s antiviral capacity works in three ways. Quercetin can:

  1. Stop the virus from infecting cells
  2. Reduce the reproduction of cells that are already infected
  3. And reduce infected cells resistance to treatment with antiviral medications

Today I’ll Show You How To Use This Natural Immunity Booster To Protect Against Deadly Viral Infections

Following the deadly avian flu outbreak in 2007, the U.S. Department of Defense tested quercetin to see if it could protect soldiers from contracting deadly viral infections…

They gave study participants a daily dose of 1,000 mg of quercetin (along with vitamin C and niacin to boosts quercetin levels and improve bioavailability) or a placebo. They found that after five weeks, those who were given quercetin were significantly less likely to develop a viral infection after putting their bodies under considerable stress for three consecutive days.

Only 5% of the treatment group got sick, compared to 45% of the placebo group.1

In a second study by the U.S. Defense Advanced Research Projects Agency (DARPA), researchers infected four groups of mice with the H1N1 virus. Two of the groups were put into stressful situations, while the others were not. Half the animals were given quercetin.

Researchers found that after three days, 50% of the control group became ill with H1N1.

Again, only 5% of the quercetin-supplemented group did.2

Quercetin Treats Broad Range of Infections – Including the Common Cold

Even the common cold can’t stand up to quercetin…

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 internalization and replication in vitro, and viral load, lung inflammation and airways hyper-responsiveness in vivo.”3

A 2016 animal study found quercetin inhibited mouse dengue virus.4 Other studies have confirmed quercetin’s power to inhibit hepatitis infections.5

And just last month, researchers found that it protects against pneumococcus, the common cause of pneumonia, meningitis and middle ear infections.

But viruses aren’t the only diseases this antioxidant can protect you from…

Quercetin can help you battle fatigue and daily stress. It shields your brain from the oxidative stress associated with Alzheimer’s.6 It strengthens blood vessels and lowers blood pressure.7

And it may lead to prevention and treatment of metabolic diseases like diabetes and obesity.

Boost Immunity and Protect Your Lungs With Quercetin

It’s more important now than ever before to take care of your immune system. Here’s what I recommend when it comes to quercetin…

    1. Find it in your food sources. I always recommend getting the nutrients you need from your food. Here are foods with the highest levels:
      Food QUERCETIN mg/100 grams
      Elderberries 42
      Red onions 33
      White onions 21
      Cranberries 15
      Green hot peppers 15
      Red apples 4.8
      Romaine lettuce 4.5
      Pears 4.5

      Keep in mind that the amount of quercetin in food depends on the conditions that the food is grown in. For example, according to research at University of California, organic tomatoes contain up to 97% more quercetin than conventionally grown tomatoes.8

  1. Supplement with quercetin. Quercetin is available as a capsule, gummy, powder and spray. Whichever form you choose to take, I recommend taking 500 mg twice a day. If you’re battling a virus, you can bump that up to 1,200 mg daily.

To Your Good Health,

Al Sears, MD, CNS


1. Davis J, et al. “Quercetin reduces susceptibility to influenza infection following stressful exercise.” Am J Physiol Regul Integr Comp Physiol. 2008 Aug;295(2):R505-9. doi: 10.1152/ajpregu.90319.2008. Epub 2008 Jun 25. 8
2. http://www.quercegen.com/science-studies.htm
3. Kinker B, et al. “Quercetin: a promising treatment for the common cold.” J Infect Dis Preventive Med. May 2014; DOI: 10.4172/2329-8731.1000111
4. Davis et al. “Quercetin reduces susceptibility to influenza infection following stressful exercise.” AJP Regulatory Integrative and Comparative Physiology, 2008; 295 (2): R505.
5. Chiow H, et al. “Evaluation of antiviral activities of Houttuynia cordata Thunb. extract, quercetin, quercetrin and cinanserin on murine coronavirus and dengue virus infection.” Asian Pac J Trop Med. 2016 Jan;9(1):1-7.
6. Lee C, et al. “Protective effects of quercetin and vitamin c against oxidative stress-induced neurodegeneration,” J Agric Food Chem. 2004;52 (25: 7514-7517.
7. Pérez-Vizcaíno F, et al. “Endothelium-independent vasodilator effects of the flavonoid quercetin and its methylated metabolites in rat conductance and resistance arteries.” J Pharmacol Exp Ther. 2002 Jul;302(1):66-72.
8. Mitchell A. “Ten-year comparison of the influence of organic and conventional crop management practices on the content of flavonoids in tomatoes.” J Agr Food Chem. 2007;55 (15):6154-6159

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