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Coronavirus Information Center

Coronavirus Information Center

Protect yourself! See our reviews of masks, air purifiers, virus and antibody tests, pulse oximeters, and information about vitamins and supplements.

Coronavirus Information Center

CL Answers (19)

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Recalls & Warnings (113)

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Clinical Updates (85)

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3/25/2020

Surprising Role of Potassium in COVID-19

New research out of China suggests that many patients hospitalized with COVID-19 are low in potassium. For details see the information about Potassium in our answer to the question: What are natural remedies for coronavirus (COVID-19)? Do supplements like zinc, vitamin C, or herbals work?
6/13/2020

Vitamin D and COVID-19 Risk

Vitamin D deficiency was associated with an increased risk of testing positive for coronavirus according to a recent study. For details see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
9/14/2021

L-Arginine for COVID?

Did L-arginine supplementation help people with severe COVID-related pneumonia? See what a new study found in the What It Does section of our L-Arginine Supplements Review.

Also see: Do any supplements help with the coronavirus (COVID-19)?
7/04/2020

Vitamin D & Coronavirus

Studies are linking low blood levels of vitamin D to higher risk of testing positive for the coronavirus and/or developing more severe disease. Find out what blood levels appear to be protective, as well as the results of the most recent study, in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
9/14/2021

COVID Vaccination and Menstruation

Does COVID-19 vaccination affect menstruation? Find out what is known in our article about COVID-19 Vaccines.
1/10/2021

Vitamin D and COVID-19

Many preliminary studies have linked adequate vitamin D levels with reduced risk of COVID-19 or less severe disease. However, a recent study did not find a benefit among people who had been supplementing with amounts generally above the recommended daily intake requirement for vitamin D. See the details in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
12/20/2020

Melatonin for COVID-19?

Can melatonin reduce the duration of symptoms in people with COVID-19? Get the details in the COVID-19 section of our Melatonin Supplements Review. Also, see our Top Picks for melatonin.
1/13/2021

High-Dose Vitamin C for COVID-19?

Does high-dose vitamin C help in people with severe COVID-19? See what a new study showed in the COVID-19 section of our Vitamin C Supplements Review.
11/26/2020

Vitamin D for COVID-19

Can high doses of vitamin D help COVID-19 patients recover? Find out what two new studies showed in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
10/27/2020

Vitamin D and COVID-19

Can taking vitamin D after getting sick with COVID-19 reduce the risk of death? Find out in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
10/31/2020

Vitamin C for COVID-19?

Does high-dose vitamin C help people critically ill with COVID-19? Find out what a new report showed in the COVID-19 section of our Vitamin C Supplement Review. Also see our Top Picks for vitamin C.
10/13/2020

Low Vitamin D & COVID-19 Risk

Studies indicate that vitamin D deficiency may increase the risk of COVID-19 infection. The most recent study suggests this risk may be greater among certain ethnic groups. Learn more in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
6/09/2020

A Role for Calcium in COVID-19?

A preliminary study suggests a possible role for calcium supplementation in treating COVID-19. See the details in the COVID-19 section of the Calcium Supplements Review. Also see our Top Picks among calcium supplements.
6/02/2020

Vitamin D for COVID-19 Patients

A study evaluated the effects of giving vitamin D, magnesium, and vitamin B12 to COVID-19 patients. See the results in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
6/20/2020

Low Potassium in COVID-19 Patients

Patients hospitalized with COVID-19 have often been found to have low potassium levels. Should you be concerned? Learn more in the COVID-19 section of the Potassium Supplements Review. Also see our Top Picks among potassium supplements.
7/08/2020

Vitamin D and COVID Severity

Another study suggests a link between having an adequate level of vitamin D and the severity of COVID-19 in patients. For details, see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
8/18/2020

Vitamin D Deficiency & COVID Death Risk

A new study suggests a link between vitamin D deficiency and higher risk of death in COVID-19 patients. For details, see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
10/13/2020

Zinc and Risk of COVID Death

A recent study found low blood levels of zinc to be associated with a greater chance of severe symptoms and death in COVID-19 patients. Does this mean that people should supplement with zinc or use zinc lozenges? Find out in the COVID-19 section of our Zinc Supplements and Lozenges Review. Also see our Top Picks for zinc supplements and lozenges.
10/24/2020

High-Dose Vitamin D for COVID?

Elderly nursing home residents given high-dose vitamin D had much better survival rates from COVID-19 than other residents, according to a new study. However, the dose given has potential risks. Get the details in the COVID-19 section of the Vitamin D Supplements Review.
1/15/2021

Vitamin K & Risk of COVID Death

A marker of low vitamin K levels has been linked to a higher risk of death in people with COVID-19, according to a new study. Get the details in the COVID-19 section of our Vitamin K Supplements Review.
8/03/2021

Tests to Detect COVID Variants?

Can standard COVID-19 tests identify which variant caused an infection? Find out in our updated CL Answer about tests for COVID-19.
9/21/2021

Medicine Helps Prevent COVID Symptoms

An FDA-authorized medicine was shown to reduce the risk of developing symptoms of COVID when given early to people testing positive for COVID. Get the details in our answer to the question: Do any treatments reduce the risk of infection after you've been exposed to someone with COVID-19?
9/28/2021

COVID + Flu Shot Timing

Find out if you can get a flu shot and COVID-19 shot at the same time and how this may affect side effects.
8/10/2021

COVID Home Test Limitations

COVID-19 home tests, like the 15-minute Abbott BinaxNOW, have significant limitations in real-world use according to a recent study.
4/28/2020

A Role for Vitamin K in COVID-19?

A new study showed a link between vitamin K and the development of COVID-19. Learn what this means in the What It Does section of our Vitamin K Supplements Review. Also see our Top Pick among vitamin K supplements.
7/18/2020

Selenium & COVID-19

Selenium-deficient people were more likely to die from COVID-19 than those who were not deficient according to a recent study. For details, see the What It Does section of the Selenium Supplements Review. Also see our Top Pick for selenium.
6/14/2020

Do Zinc Lozenges Help?

Several individuals diagnosed with COVID-19 began using zinc lozenges after they became sick. Find out if this was reported to help or not in the COVID-19 section of the Zinc Supplements Review. Also see our Top Picks for zinc supplements and lozenges.
1/13/2021

Vitamin D & Risk of COVID Death

A recent study in the U.S. found that people hospitalized with COVID had much lower rates of death with certain blood levels of vitamin D. Get the details in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
10/20/2020

Melatonin and COVID-19

Can melatonin supplementation reduce the risk of death in people with severe COVID-19? See what a recent study showed in the What It Does section of our Melatonin Supplements Review. Also see our Top Picks for melatonin.
8/10/2021

Herbal Treatment

Are traditional Chinese medicines, such as astragalus, helpful in treating or preventing COVID-19? Find out what reviews of the research have concluded in our article about Supplements and COVID-19.
8/07/2021

COVID Transmission Among Vaccinated?

Can you catch COVID from someone who is vaccinated if you are vaccinated? Find out what data suggests in our article about COVID-19 Vaccines.
8/07/2021

Vaccination in People Who've Already Had COVID

How much protection do vaccines provide to people who've already had COVID? See what a recent study suggests in our article about COVID-19 Vaccines.
8/17/2021

COVID Infectiousness

Be aware that even without symptoms, people with COVID-19 can emit high amounts of virus as aerosols, according to recent research. Get the details and find out what researchers recommend to help protect yourself when indoors.
8/03/2021

Ivermectin

Find out why ivermectin is generally not recommended for COVID-19 outside of clinical trials, despite some research suggesting a benefit.
8/25/2021

Ivermectin

More information highlights why ivermectin should be used for COVID-19 only within clinical trials. Get the details.
8/28/2021

J&J Booster Vaccine

Data suggests that a booster dose of the J&J vaccine can significantly boost immune protection against COVID-19. Get the details.
8/31/2021

N95 Mask Quality Problem

Federal approval was recently revoked for all N95 masks made by a certain manufacturer. Get the details in our article about the Best Masks to Prevent COVID-19.
10/02/2021

AstraZeneca Vaccine Efficacy & Side Effects

Find out how effective the AstraZeneca vaccine (not currently available in the U.S.) is at preventing COVID-19. Also learn the most common side effects of the AstraZeneca vaccine.
4/14/2020

Zinc Concern

Zinc is a popular supplement right now due to COVID-19, but be aware that taking large doses of zinc for a long period of time can suppress the immune system by causing or exacerbating copper deficiency. Certain people may be more at risk for this. Get the details in the Cautions and Concerns section of the Zinc Supplements and Lozenges Review.
3/31/2020

Is Quercetin Safe?

Quercetin has been proposed as a treatment for a range of medical conditions, including COVID-19, but is it safe? Find out what studies have found, including results of a recent, small clinical trial, in the Concerns and Cautions section of the Quercetin Supplements Review. Also see our Top Picks for quercetin.
3/17/2020

How Long Does Coronavirus Last On Surfaces?

We've added new information about how long the coronavirus might last on packaging, and how this varies greatly depending on the package material, in our answer to the question: Can I get the new coronavirus (2019-nCoV) from supplements from China?
9/07/2021

COVID Symptoms in Breakthrough Cases

Fully vaccinated people who get COVID are much less likely to experience symptoms, as well as long-COVID, than unvaccinated people with COVID to according to a recent study. Get the details.
9/24/2021

Resveratrol for Mild COVID?

A recent study gave resveratrol to people with mild COVID. Find out if it reduced hospitalization, ER visits or pneumonia in the What It Does section of our Resveratrol Supplements Review.

See information about the use of other supplements for COVID.
9/28/2021

Risk of Infecting Others

While vaccines are good at keeping you from getting severely ill from COVID, be aware that if you get COVID, you may be as infectious as a non-vaccinated COVID patient, according to several recent reports.
10/08/2021

Shingles Vaccine & COVID

Does getting a shingles vaccine reduce COVID risks?
10/08/2021

Home COVID Test Recalled

Certain lots of a popular home COVID test have been recalled after they were discovered to provide inaccurate results.
10/09/2021

Substance Abuse & COVID

People with substance use disorders, particularly regarding cannabis, may be at increased risk for COVID infection, according to a recent study.
9/03/2021

Kidney Injury and COVID

Kidney injury appears to be more common in some people who have had COVID, according to a recent study.
8/14/2021

COVID Vaccination During Pregnancy

Vaccination is now recommended during pregnancy. Get the latest details in our article about COVID Vaccines.
8/28/2021

15-Minute Home COVID Tests

Demand for 15-minute home tests for COVID is increasing. Learn when and how to use these tests.
12/16/2020

High-Dose Fish Oil for COVID?

A two-week course of high-dose, high-concentration fish oil was reported to reduce inflammation and symptoms in COVID patients in a preliminary study. See the details in the What It Does section of the Fish Oil Supplements Review. Also, see our Top Picks for fish oil supplements.
8/28/2021

Six or Eight Months for mRNA COVID Booster?

Will mRNA booster vaccines be given as early as 6 months after the first dose, or at 8 months as had been officially announced? Find out in our article about COVID Vaccines.
8/31/2021

Delta Variant Accounts for Most COVID Cases

Be aware that the Delta variant, which is more transmissible than other variants, now accounts for more than 98% of COVID cases in the U.S. See the latest numbers.
8/31/2021

Risk of Hospitalization With COVID

If you are unvaccinated, how much more likely are you to be hospitalized with COVID than if you were vaccinated? See what recent data shows.
10/08/2021

Home Device May Reduce Risk of COVID Death

New evidence suggests that using a pulse oximeter when home with COVID may reduce the risk of death. We've added information about this to our answer to the question: Which is the best pulse oximeter for home use?
9/24/2021

Antibody Therapy for COVID

Due to a shortage in supply, there has been a change in how antibody therapies for COVID are being distributed in the U.S. Find out how this may affect your ability to access these therapies.
10/12/2021

More About Shingles Vaccines & COVID

We recently reported that getting a shingles vaccine was linked to lower COVID risk. A CL member asked us if this association applied to Shingrix, Zostavax or both vaccines. See the answer.
8/28/2021

Myocarditis Risk

Find out how the risk of myocarditis from vaccination compares to the risk of myocarditis from COVID.
9/11/2021

Mu Variant

What is the Mu variant and how prevalent is it in the U.S.? Find out in our article about COVID Vaccines.
8/03/2021

Hospitalization or Death in Vaccinated People

How likely is hospitalization or death from COVID in vaccinated people? See what recent data shows.
10/22/2021

Huge Boost from Booster Vaccines

New data showed a huge reduction in symptomatic COVID cases with the Pfizer booster Get the details.
10/02/2021

Vaccine-Related Myocarditis in Young Men

See whether Moderna or Pfizer has been linked to a greater risk of myocarditis among young men. (Note: The risk of myocarditis remains much higher from getting COVID than from either vaccine.)
10/02/2021

Sanitizer Warning

Consumers are being warned not to use a specific hand-held UV sanitizing wand that could cause skin or eye injury within seconds of use. Details are in our updated article about UV Light Sanitizers and COVID.
9/17/2021

Vaccines and Shoulder Injury

Shoulder injury from vaccination is not common but can happen. Find out what steps you can take to help avoid it. Also learn about "COVID arm."
8/07/2021

COVID Vaccination in People With Neurologic Conditions

Should people with neurologic conditions – including dementia, Alzheimer's disease, MS, and epilepsy – get vaccinated? Find out what experts recommend.
8/10/2021

Pfizer vs. Moderna for Breakthrough Delta Infections

A recent study suggests that Pfizer and Moderna are not equal in protecting against Delta infection. See the details in our article about COVID Vaccines.
8/10/2021

COVID Risk & Immune Disease

Are people with rheumatoid arthritis, psoriatic arthritis, lupus, and other immune diseases at higher risk of severe re-infections? See the latest findings.
8/28/2021

Withdrawal of CDC COVID PCR Test?

Is it true that the current PCR tests for the virus are not accurate and the CDC is withdrawing its own PCR test? Get the facts.