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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 CenterProduct Reviews (9)
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CL Answers (20)
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Clinical Updates (161)
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3/25/2020
Surprising Role of Potassium in COVID-19
4/08/2022
Andrographis for COVID-19?
Despite early evidence suggesting a benefit, andrographis does not appear to help patients with COVID-19, according to a recent report. Get the details in our updated answer to the question: Do any supplements help with the coronavirus (COVID-19)?
2/04/2022
Vitamin D & Death From COVID
Some research suggests that low blood levels of vitamin D increase the risk of death from COVID, but a new study suggests that high levels also increase risk. Get the details in the COVID section of our Vitamin D Supplements Review.
Also see our answer to the question: Do any supplements help with the coronavirus (COVID-19)?
2/23/2022
Vitamin D for COVID?
Does high-dose vitamin D help people hospitalized with COVID? See what a recent study showed in the COVID section of our Vitamin D Supplements Review.
Also see our answer to the question: Do any supplements help with the coronavirus (COVID-19)?
6/13/2020
Vitamin D and COVID-19 Risk
9/14/2021
L-Arginine for COVID?
Also see: Do any supplements help with the coronavirus (COVID-19)?
7/04/2020
Vitamin D & Coronavirus
11/11/2021
Sleep, Drink, and COVID Hospitalization Risk
12/30/2021
Hand Sanitizer vs. Soap
9/14/2021
COVID Vaccination and Menstruation
11/23/2021
Reduced "Long" COVID-19 Risk with Vaccination
2/11/2022
Melatonin & COVID
Can supplementing with melatonin help prevent death among people hospitalized with COVID-19? See what a recent study found in the COVID-19 section of our Melatonin Supplements Review, which includes our Top Picks for melatonin.
Also see our answer to the question: Do any supplements help with COVID-19?
3/01/2022
Melatonin to Prevent COVID?
Does taking melatonin help prevent COVID-19? Find out what a study found in the COVID-19 section of our Melatonin Supplements Review.
Also see our article about Supplements for COVID.
3/01/2022
COVID-19 and Hair Loss?
Can COVID-19 cause hair loss? Find out in How to You Take Care of Yourself After You’ve Had COVID-19.
1/18/2022
Probiotics for COVID-19 Symptoms?
10/31/2020
Vitamin C for COVID-19?
11/26/2020
Vitamin D for COVID-19
1/13/2021
High-Dose Vitamin C for COVID-19?
12/20/2020
Melatonin for COVID-19?
1/10/2021
Vitamin D and COVID-19
10/27/2020
Vitamin D and COVID-19
6/02/2020
Vitamin D for COVID-19 Patients
6/20/2020
Low Potassium in COVID-19 Patients
6/09/2020
A Role for Calcium in COVID-19?
10/13/2020
Zinc and Risk of COVID Death
10/24/2020
High-Dose Vitamin D for COVID?
1/15/2021
Vitamin K & Risk of COVID Death
8/03/2021
Tests to Detect COVID Variants?
11/23/2021
COVID-19 Vaccines and Menstruation
1/11/2022
COVID-19 and Menstrual Cycles
2/23/2022
Paxlovid for COVID-19?
How well does Paxlovid reduce risk of hospitalization or death due to COVID-19 in people who are unvaccinated? Find out in our updated answer about COVID Treatments.
3/18/2022
Best COVID Vaccine for Breast-Feeding Women?
For women who are breast-feeding, find out which COVID-19 vaccines are most likely to result in antibodies against COVID-19 in breastmilk.
9/21/2021
Medicine Helps Prevent COVID Symptoms
8/17/2021
COVID Risk of Death
2/25/2022
Zinc & COVID
Can taking zinc and vitamin C after being diagnosed with COVID-19 boost antibody production? Find out what a recent study found in the COVID section of our Zinc Supplements Review.
Also see our article about Supplements for COVID.
8/10/2021
COVID Home Test Limitations
9/03/2021
Fibromyalgia After COVID
9/28/2021
COVID + Flu Shot Timing
9/28/2021
Flu Shot and Risk of COVID Complications
11/02/2021
Low-Dose Prednisone and COVID Vaccines
11/15/2021
Flu & COVID Vaccines
11/15/2021
Protection from Past COVID Infection?
2/23/2022
Vaccination After COVID Infection
Getting vaccinated after COVID-19 appears to drastically reduce the risk of reinfection, according to a recent study.
1/25/2022
Timing Vaccines Around COVID Drugs
1/21/2022
Rapid COVID-19 Tests At No Charge
8/10/2021
Herbal Treatment
4/28/2020
A Role for Vitamin K in COVID-19?
10/20/2020
Melatonin and COVID-19
6/14/2020
Do Zinc Lozenges Help?
7/18/2020
Selenium & COVID-19
8/07/2021
COVID Transmission Among Vaccinated?
8/07/2021
Vaccination in People Who've Already Had COVID
1/13/2021
Vitamin D & Risk of COVID Death
3/18/2022
Blood Type & Long COVID
People with a particular blood type appear more likely to experience long COVID, according to a recent study. Get the details in our answer to the question: How Should You Take Care of Yourself After You've Had COVID-19?
3/01/2022
Check Your Area’s COVID Risk
You can now check if your area in the U.S. is at High, Medium, or Low risk for COVID and the CDC's mask recommendations for your area. Check your community's COVID-19 level.
8/17/2021
COVID Infectiousness
11/05/2021
Quercetin & COVID
11/18/2021
Black Seed for COVID?
12/07/2021
Quercetin for Severe COVID?
10/02/2021
Booster for Fully Vaccinated People Who've Had COVID?
8/28/2021
Biotin Interference With COVID Tests
1/28/2022
CBD To Reduce COVID Risk?
5/13/2022
Paxlovid Interaction With Supplements
Paxlovid is strongly recommended for COVID treatment, but be aware that it may interact negatively with certain supplements, as well as many drugs. Get the details in CL Answer about COVID-19 treatments.
4/29/2022
Vaccines and Appendicitis
3/08/2022
More Home Tests Without Cost
3/29/2022
Benefit of a Second Booster
Second boosters may significantly reduce the risk of severe COVID-19 in older people, according to a recent study.
2/01/2022
Vaccines, Blood Pressure, and Thyroid Symptoms
2/01/2022
Reinfection From Omicron
9/14/2021
Vaccines Compared: Pfizer, Moderna, or J&J
8/03/2021
Ivermectin
8/25/2021
Ivermectin
4/14/2020
Zinc Concern
3/31/2020
Is Quercetin Safe?
10/02/2021
AstraZeneca Vaccine Efficacy & Side Effects
8/28/2021
J&J Booster Vaccine
8/31/2021
N95 Mask Quality Problem
11/23/2021
COVID-19 Booster Shots: Who is Eligible?
11/26/2021
COVID-19 Booster Shots & Antibodies
11/26/2021
Fiberglass HEPA Filters
1/07/2022
Rapid, Home PCR Tests Compared
1/07/2022
Testing After Isolation?
2/04/2022
Shelf-Lives of Home COVID-19 Antigen Tests
If you’re storing a test for future use, be aware that shelf-lives range from just 5 ½ months to 12 months from time of manufacture. See how shelf-lives of popular brands compare.
Also see our Top Picks among antigen tests based on their accuracy and other features.
2/08/2022
What To Do If You Test Negative, or Positive
We’ve summarized the latest information about when to use a home test and what to do if you get a negative, or a positive result. It’s all in the Antigen Tests section of our comprehensive article about testing for COVID-19.
1/21/2022
Supplement Interactions with Paxlovid
12/28/2021
Air Purifiers for Odor Removal?
Can air purifiers that remove virus particles from the air also eliminate odors? Find out in the Technologies for Removing Odors section of our answer to the question: Which air purifiers are best for reducing the spread of COVID-19?
Also see our Top Picks among air purifiers.
3/08/2022
Is 5-Day Isolation Enough?
3/17/2020
How Long Does Coronavirus Last On Surfaces?
9/07/2021
COVID Symptoms in Breakthrough Cases
11/11/2021
Long COVID Symptoms Not Due to COVID?
11/09/2021
COVID Booster & Risk of Spreading Infection
11/09/2021
Antibody Levels: Having Had COVID vs. Being Vaccinated
11/18/2021
Fish Oil for COVID?
12/07/2021
Chances of COVID Reinfection with Omicron Variant
9/11/2021
Flu Vaccine & COVID
9/28/2021
Risk of Infecting Others
9/24/2021
Resveratrol for Mild COVID?
See information about the use of other supplements for COVID.
2/11/2022
Vitamin D & COVID
What vitamin D levels are associated with the lowest risk of getting severe COVID?
Does raising vitamin D levels shorten the duration of COVID symptoms? See what a recent study found.
Also see our Top Picks for vitamin D.
10/08/2021
Shingles Vaccine & COVID
9/03/2021
Kidney Injury and COVID
8/31/2021
Adolescents & COVID: Myocarditis vs. Hospitalization
8/31/2021
Off-Label Use of COVID Vaccine?
8/28/2021
15-Minute Home COVID Tests
12/24/2021
At-Home COVID Testing
1/11/2022
Booster After COVID?
11/15/2021
COVID Vaccines & Shingles
10/08/2021
Home COVID Test Recalled
10/09/2021
Substance Abuse & COVID
8/14/2021
COVID Vaccination During Pregnancy
1/14/2022
At-Home COVID Tests Without Charge
3/04/2022
Caution: Many Still Positive After 5 Day Isolation
People with COVID must isolate for 5 days, but many are positive on antigen tests for up to 9 days. Find out who is most at-risk for this, in our updated answer about COVID Tests.
3/31/2022
How to Get COVID Treatment Quickly
3/25/2022
No-Cost COVID Vaccine Eligibility Ending?
Take note: After April 4, some people in the U.S. may no longer be able to get a COVID vaccine without paying out of pocket.
2/15/2022
New COVID Treatment
8/22/2021
COVID Vaccine 8-Month Booster
12/16/2020
High-Dose Fish Oil for COVID?
10/12/2021
More About Shingles Vaccines & COVID
8/31/2021
Risk of Hospitalization With COVID
11/05/2021
Flu Shot + COVID Booster?
12/03/2021
Best Rapid Home Test for COVID
The FDA has authorized many 15-minute home tests for COVID, but some are better than others at identifying positive samples. See our Top Pick among rapid home tests and how brands compare.
Be aware that these home tests, which can be bought without a prescription, are best used within six days of the start of symptoms. It is likely that they can detect the new Omicron variant. The cost of buying these tests may soon be covered by insurance.
12/03/2021
Home Pulse Oximeter Use Decreases Risk of COVID Death
12/07/2021
More COVID Home Tests Reviewed — See If They Made Our Cut
12/10/2021
Home COVID Tests
8/28/2021
Six or Eight Months for mRNA COVID Booster?
8/31/2021
Delta Variant Accounts for Most COVID Cases
9/24/2021
Antibody Therapy for COVID
10/08/2021
Home Device May Reduce Risk of COVID Death
8/22/2021
COVID Vaccine and Anemia
8/14/2021
Which Immunosuppressants Reduce Vaccine Protection?
8/03/2021
Hospitalization or Death in Vaccinated People
10/02/2021
COVID Vaccine for Women Who Are Pregnant
9/11/2021
Mu Variant
8/28/2021
Are COVID Booster Doses Different?
8/28/2021
Myocarditis Risk
10/22/2021
Huge Boost from Booster Vaccines
2/18/2022
Myocarditis After COVID Boosters
Myocarditis appears to be much less common with boosters than with 2nd doses of Pfizer or Moderna vaccines according to new data.
2/15/2022
Boosting Vaccine Response
Exercising around the time of a COVID vaccine may help boost immune response, according to a recent study.
2/15/2022
COVID Vaccines and Monoclonal Antibody Therapy
For people who received monoclonal antibody therapy: Find out if you need to delay vaccinations.
8/07/2021
COVID Vaccination in People With Neurologic Conditions
8/10/2021
Pfizer vs. Moderna for Breakthrough Delta Infections
8/10/2021
COVID Risk & Immune Disease
11/02/2021
Pfizer COVID Vaccine for Children
12/10/2021
Home Pulse Oximeters for anemia?
1/14/2022
Mouth v. Nose Swabs for COVID Antigen Testing
8/28/2021
Withdrawal of CDC COVID PCR Test?
9/11/2021
Hunter HP800 Air Purifier Review
9/11/2021
LG PuriCare Mini Air Purifier Review
10/02/2021
Vaccine-Related Myocarditis in Young Men
10/02/2021
Sanitizer Warning
9/17/2021
Vaccines and Shoulder Injury
1/21/2022
CDC Mask Guidelines
2/08/2022
At-Home COVID Testing for Medicare Beneficiaries
In early spring of 2022, eligible Medicare beneficiaries will be able to receive 8 at-home rapid tests per month at no charge. Get the details.
1/28/2022
How Good Are COVID Tests From the Government?
Readers have started to receive rapid antigen tests, such as iHealth, from the government. See how this compares to other antigen tests and our Top Picks.
Let us know which test you received by mail from the U.S. government – we'll review it if we haven't already.
If you need to order tests at no charge, here's how.
4/14/2022
Do You Need a Pulse Oximeter at Home?
When home with COVID, a recent study showed that actively monitoring for breathing symptoms may be as or more important than having a pulse oximeter. For details, see our article about pulse oximeters.
3/22/2022
COVID Vaccine: Will There Be a Second Booster?
The FDA has received requests from Pfizer and Moderna for a 2nd booster. Find out who might be eligible for a 2nd booster and when.
Recalls & Warnings (132)
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4/20/2021
Chiropractor Who Claimed Vitamin D and Zinc Work Better Than COVID Vaccines Charged by FTC
5/09/2020
FDA Warns Sellers of Essential Oils, CBD, Vitamins, and More Promoted to Treat Coronavirus
News Releases (7)
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