Views: 0 Author: Site Editor Publish Time: 2025-03-13 Origin: Site
A study published in 2007 funded by the U.S. Department of Defense found that after experiencing extreme physical stress, quercetin reduces the risk of contracting viruses and improves your mental performance that might otherwise disrupt your immune function, leaving you more vulnerable to disease.
In the study, scientists have compared with the athletes with and without taken the quercetin, and they found that the cyclists who have taken 1,000 milligrams of quercetin a day for five weeks, along with vitamin C (which boosts plasma quercetin levels) and niacin (which boosts absorption) were significantly less likely to contract a viral illness after cycling for three hours a day for three days. Forty-five percent of people in the placebo group got sick, compared with five percent in the treatment group.
The Defense Advanced Research Projects Agency (DARPA) funded another study, published in 2008, that used the highly pathogenic H1N1 influenza virus to challenge animals treated with quercetin. Again, morbidity and mortality were significantly lower in the treatment group than in the placebo group.
A 2010 animal study found that quercetin inhibited both influenza A and influenza B viruses. There were two other big discoveries. First, these viruses do not develop resistance to quercetin; Second, when used in combination with antiviral drugs (amantadine or oseltamivir), the effect is significantly enhanced - and the development of resistance is prevented.
A recent study published in the journal Microbial Pathogenesis in March 2020 found that quercetin provides "comprehensive protection against STREptococcus pneumoniae infection" both in vitro and in vivo by neutralizing a toxin (PLY) released by Pneumococcus, to prevent an outbreak of pneumococcal infection.
In addition to its antiviral activity, quercetin can boost immunity and fight inflammation. Research shown that, it inhibits the production of enzymes that cause inflammation and intestinal mast cells release histamine and serotonin, etc. Furthermore, quercetin can also stabilize mast cells and has cytoprotective activity in the gastrointestinal tract.
