The debate about whether the antimalarial drug hydroxychloroquine is an effective treatment for COVID-19 continues, as a Chinese trial1,2,3,4 comparing clinical outcomes of those treated with the drug and those receiving standard of care alone reports “disappointing” results. Hydroxychloroquine Trial Reports Disappointing ResultsSeventy-five COVID-19 patients at 16 Chinese treatment centers received 1,200 milligrams of hydroxychloroquine in addition to standard of care for the first three days of treatment, followed by a maintenance dose of 800 mg per day for two weeks in mild to moderate cases and three weeks for severe cases. Another 75 patients received standard of care only. The primary endpoint was a 28-day negative conversion rate of SARS-CoV-2 (viral load reduction). Secondary endpoints included improvement rate of clinical symptoms and the normalization of C-reactive protein and blood lymphocyte count within 28 days. According to the authors, the hydroxychloroquine group only had a 28-day negative conversion rate of 85.4% compared to the control group’s rate of 81.3%. No difference in the alleviation of symptoms was observed between the two groups. Adverse events were also higher in the hydroxychloroquine group (30%) compared to controls (8.8%). You can find a listing of the adverse events in Table 2 of the study.5 The most common adverse event, at 10%, was diarrhea. That said, the authors point out that:6
Limitations of This StudyA few things are worthy to note about this study. Aside from its small size, the patients received a far higher dose of hydroxychloroquine than typically used in the U.S. — 1,200 milligrams for the first three days, followed 800 mg per day for two to three weeks, compared to the U.S. Food and Drug Administration’s suggested dosage of 800 mg on Day 1, followed by 400 mg per day for four to seven days, depending on severity.7 Secondly, most patients had mild disease with little hypoxemia, and thirdly, treatment was administered quite late, on average 16 to 17 days after the onset of disease. Commenting on the findings, Josh Fargas, associate professor of pulmonary and critical care medicine at the University of Vermont writes:8
This Study Failed to Use ZincPerhaps most importantly, however, is the absence of zinc, which Fargas does not mention. We now know that chloroquine and hydroxychloroquine act as zinc ionophores,9,10 meaning they shuttle zinc into your cells, and zinc appears to be a “magic ingredient” required to prevent viral infection.11 If given early, zinc along with a zinc ionophore should, at least theoretically, help lower the viral load and prevent the immune system from becoming overloaded. Without zinc, hydroxychloroquine may be more or less useless. So, in my view, I doubt this study is worth placing too much stock in, seeing how it did not administer supplemental zinc. As noted in the preprint paper, “Does Zinc Supplementation Enhance the Clinical Efficacy of Chloroquine / Hydroxychloroquine to Win Todays Battle Against COVID-19?” published April 8, 2020:12
Chloroquine Trial Stopped Due to Side EffectsIn related news, a Brazilian chloroquine trial13,14 stopped the high-dose arm of the study early due to patients developing ventricular tachychardia, a dangerous heart rhythm problem. As reported by Live Science:15
As explained in my previous article, “Antimalarial Medications: A COVID-19 Treatment Option?” chloroquine and hydroxychloroquine have been shown to be effective in the lab against the SARS coronavirus that appeared in 2003.16,17,18 Laboratory testing also suggests chloroquine is effective in cell cultures against COVID-19 when combined with an antiviral drug, remdesivir.19 However, chloroquine (Aralen) appears to be a more hazardous choice than hydroxychloroquine (Plaquenil), which is a derivative of chloroquine.20 Both use the same pathway, but hydroxychloroquine is thought to be about 40% less toxic21 and, overall, has a safer side effect profile.22,23 Quercetin — A Safer Alternative to Hydroxychloroquine?Considering the risks of chloroquine and hydroxychloroquine, and the evidence suggesting the reason these drugs work for COVID-19 is because they act as zinc ionophores, it’s worth questioning whether other more natural zinc ionophores can be used. One prime example would be quercetin, which is a naturally occurring zinc ionophore.24 As reported by the Green Stars Project,25 “Researchers from Oak Ridge National Lab used the world’s most powerful supercomputer, SUMMIT, to look for small molecules that might inhibit the COVID-19 spike protein from interacting with human cells and, interestingly, quercetin is fifth on that list.”26 Quercetin is one of only three natural products found to inhibit the SARS-CoV-2 spike protein. The only natural product found to be slightly more effective is luteolin, a polyphenol found in radicchio, green peppers, serrano and green hot chili peppers, chicory, celery and many other foods.27 Quercetin is another flavonols compound found in a variety of foods, including apples, Brassica vegetables, capers, onions, tea and tomatoes, just to name a few. It’s also contained in medicinal products such as Ginko biloba, St. John’s Wort (Hypericum perforatum) and elderberry (Sambucus canadensis). Research has already demonstrated that quercetin is a powerful immune booster and broad-spectrum antiviral. As noted in a 2016 study28 in the journal Nutrients, quercetin’s mechanisms of action include the inhibition of lipopolysaccharide (LPS)-induced tumor 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. Quercetin also inhibits the release of pro-inflammatory cytokines and histamine by modulating calcium influx into the cell.29 According to this paper, quercetin also stabilizes mast cells and has “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.”30 Another 2016 study31 concluded it helps modulate the NLRP3 inflammasome, an immune system component involved in the uncontrolled release of pro-inflammatory cytokines that occurs during a cytokine storm. In vitro studies32,33,34 have shown quercetin exerts antiviral activity against SARS-CoV, and preliminary findings35 suggest quercetin can inhibit the SARS-CoV-2 main protease as well. You can get even more details about the anti-inflammatory and antiviral powers of quercetin in “Quercetin Lowers Your Risk for Viral Illnesses.” Quercetin Being Studied for Its Use Against COVID-19The good news is researchers are in fact planning to study the use of quercetin against COVID-19.36 As reported by Maclean’s,37 Canadian researchers Michel Chrétien and Majambu Mbikay began investigating quercetin in the aftermath of the SARS epidemic that broke out across 26 countries in 2003. They discovered a derivative of quercetin provided broad-spectrum protection against a wide range of viruses, including SARS.38,39 The Ebola outbreak in 2014 offered another chance to investigate quercetin’s antiviral powers and, here too, they found it effectively prevented infection in mice, “even when administered only minutes before infection.” So, when the COVID-19 outbreak was announced in Wuhan City, China, in late December 2019, Chrétien contacted colleagues in China with an offer to help. In February 2020, Chrétien and his team received an official invitation to begin clinical trials. According to Maclean’s:40
Dosage Recommendations for Quercetin and ZincWhile the COVID-19 pandemic is in full swing — and for any future influenza season — supplementing with quercetin and zinc may be a good idea for many, in order to boost your immune system’s innate ability to ward off infectious illness. As for dosage, here are some basic recommendations: • Quercetin -- According to research from Appalachian State University in North Carolina, taking 500 mg to 1,000 mg of quercetin per day for 12 weeks results in “large but highly variable increases in plasma quercetin … unrelated to demographic or lifestyle factors.”41 • Zinc (and copper) -- When it comes to zinc, remember that more is not necessarily better. In fact, it can backfire. When taking zinc, you also need to be mindful of maintaining a healthy zinc-to-copper ratio. As noted by Chris Masterjohn, who has a Ph.D. in nutritional sciences,42 in an article43 and series of Twitter posts:44
How Much Zinc Do You Need?Masterjohn goes into even greater detail in his zinc article, discussing maximum absorption rates and much more.45 In summary, he recommends taking 7 mg to 15 mg of zinc four times a day, ideally on an empty stomach, or with a phytate-free food. The recommended dietary allowance in the U.S is 11 mg for adult men and 8 mg for adult women, with slightly higher doses recommended for pregnant and breastfeeding women,46 so we’re not talking about taking significantly higher dosages. Additionally, you can take one zinc acetate lozenge per day, which will provide you with an additional 18 mg of zinc. If you’re exposed to the virus, take one additional lozenge after the exposure. Masterjohn stresses that you’ll want to keep your total zinc intake below 150 mg per day to avoid negative effects on your immune system. He also recommends getting at least 1 mg of copper from food and supplements for every 15 mg of zinc you take. Keep in mind that there are many food sources of zinc, so a supplement may not be necessary. I eat about three-fourths of a pound of ground bison or lamb a day, which has 20 mg of zinc. I personally don’t take any zinc supplement other than what I get from my food, which is likely in an optimal form to maximize absorption. from http://articles.mercola.com/sites/articles/archive/2020/04/27/is-quercetin-safer-alternative-to-hydroxychloroquine.aspx
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