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Recalls & Warnings (87)

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Clinical Updates (28)

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5/30/2020

Cranberry for Cystitis in Men?

Cystitis (inflammation of the bladder) is common in men undergoing radiation therapy for prostate cancer. A study evaluated whether a cranberry supplement could reduce the incidence of cystitis in these men. Find out if it helped in our updated answer to the question: Are cranberry supplements helpful for men? Can they help with symptoms of prostatitis or urinary tract infections?
11/04/2012

Vitamin D and Bladder Cancer

A new study looked at vitamin D levels and the risk of developing bladder cancer. Find out which levels were best, as well as which vitamin D supplements pass our tests, in the updated Vitamin D Supplements ReviewMore >>
12/06/2020

Cranberry for Overactive Bladder?

Can cranberry supplements help with overactive bladder? See what a new study found in our article about Cranberry and Urinary Health.
10/05/2021

Glycine for Urinary Frequency?

Can supplementation with the amino acid glycine improve symptoms of overactive bladder or reduce urinary frequency? See what a new study found in our updated answer to the question: Can glycine improve sleep or reduce nighttime urinary frequency?
3/16/2019

Vitamin D for Overactive Bladder?

Vitamin D supplementation may help vitamin D-deficient people who suffer from urinary urgency or frequency. Get the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
11/12/2019

A Chew for UTIs?

A study investigated whether a cranberry chew could inhibit infection-causing bacteria from binding to cells (which is necessary for urinary tract infections to occur) by testing participants' urine. Find out if it worked in our answer to the following question: Can cranberry juice or cranberry supplements prevent urinary tract infections (UTIs)?
6/17/2015

High-Dose Vitamin D Increases Upper Respiratory Infections

A study among older people found that taking a high dose of vitamin D every 2 months increased the risk of upper respiratory infection by 48% compared to taking low-dose vitamin D daily. Infections lasted two days longer for those taking the high dose versus the low dose. For details, including dosage, as well as our test reports on vitamin D supplements, see the Vitamin D Supplements Review >>
9/20/2015

Adequate Vitamin D Reduces Frequent Respiratory Infections

A study in people with frequent respiratory infections found that taking vitamin D for one year resulted in fewer infections than taking placebo. In contrast, a similar study did not find a benefit. Why the difference? Find out in the Vitamin D Supplements Review >>
12/21/2021

Omicron Infection May Be Just As Severe As Delta

Data from the U.K. suggests that Omicron infections may be as severe as those from Delta, in contrast to earlier findings from South Africa.

Getting a booster dose appears to provide significant protection against symptomatic infection with Omicron.

6/09/2013

Does Vitamin D Prevent Ear Infection?

Maintaining adequate levels of vitamin D in children appears to reduce mild ear infections, but too much vitamin D may have a downside. Find out the details in our updated Vitamin D Supplements Review >>
5/29/2014

Probiotic Gum for Throat Infections

A gum containing a probiotic has been found to significantly reduce the incidence of throat infections in children and has been approved to promote oral health and reduce bad breath. For more details, as well as our tests of probiotic supplements, see the update in the Probiotic Supplements Review >> 
9/02/2015

Probiotic Approved for Throat Infections

A branded probiotic lozenge can help reduce the frequency of certain throat infections, including strep, according to a health claim recently approved in Canada. Details about the product (which is also available in the U.S.) are found in the Probiotic Supplements Review >>
10/21/2015

Probiotic Shortens Respiratory Infections

Studies have shown probiotics to reduce the duration and severity colds when taken throughout a cold season. A new study in children shows short-term use of a probiotic -- started at the time a household member gets sick -- also significantly reduces the duration and severity of acute respiratory infections. For details, including our tests of probiotic supplements, see the Probiotic Supplements Review >>
7/06/2019

Infection from Probiotic

Although rare, be aware that infections have occurred in some people due to the probiotics they have taken. For details about recent cases, see the Concerns and Cautions section of the Probiotic Supplements Review. Also see our Top Picks among probiotics.
1/10/2017

High-Dose Vitamin D Reduces Respiratory Infections, But With a Risk

A study among older men and women found those who took high-dose vitamin D had fewer acute respiratory infections, but a greater number of falls. Get the details in the "What It Does" section of the Vitamin D Supplements Review >>
10/01/2019

Probiotic for Cold Symptoms and Gas

A study found that a particular probiotic strain reduced symptoms of upper respiratory infections, as well as gas, in children. For details see the Colds and acute respiratory infections section as well as the Bloating, gas, and abdominal pain section of the Probiotic Supplements Review. Also see our Top Picks for probiotics and kombucha.
7/24/2021

Cranberry for H. pylori Infection?

Can cranberry juice help treat H. pylori infection – a cause of stomach inflammation and ulcers? See what a new study found in the What It Does section of our Cranberry Juices and Supplements Review. Also see our Top Picks among cranberry juices and supplements.
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.
7/03/2021

Probiotics for C. difficile infection?

New guidelines recommend against probiotics for treating or preventing C. difficile infection, one cause of diarrhea in people taking antibiotics. Find out why in the What They Do section of our Probiotic Supplements Review.
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.
12/30/2021

Comparison of D-Mannose Products – Used to prevent UTIs

We added comparisons of several brands of D-mannose to our answer to the question: Can D-mannose help prevent urinary tract infections?
1/14/2022

Moderna Effectiveness Against Omicron

Find out how effective the Moderna vaccine and booster is against infection with the Omicron variant, and how this decreases over time, according to recent analyses.