Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Asthma Health Center

Font Size

Vitamin D May Help Treat Some Asthma

Benefit Seen in Small Study of Patients With Steroid-Resistant Asthma
WebMD Health News
Reviewed by Louise Chang, MD

Dec. 8, 2005 -- Vitamin D could help treat steroid-resistant asthma, scientists report.

Their small pilot study in The Journal of Clinical Investigation shows that vitamin D may help people with steroid-resistant asthma respond better to steroid pills taken for asthma.

That's based on lab tests done on cells, as well as a brief experiment with a small group of asthma patients.

Vitamin D might also help treat other diseases involving inflammation and the immune system, write the researchers. However, their study doesn't include any recommendations about taking vitamin D supplements.

The asthma experts who led the study included Catherine Hawrylowicz, PhD, of King's College London.

Steroid-Resistant Asthma

The study focused on asthma that doesn't respond to steroid treatments.

Steroids help many people manage their asthma. Most asthma patients take their steroids through inhaled medications.

Others must take steroid pills to control their asthma, especially during acute attacks. Some of those patients don't respond to steroids. That limits their treatment options.

Testing Vitamin D

The form of vitamin D used in this study was calcitriol, or vitamin D-3. It's the form of vitamin D that the body uses. It's also the type found in many vitamin supplements.

First, the researchers took blood samples from a small group of people with and without steroid-resistant asthma.

The scientists studied the patients' T-cells, which are made by the immune system. The T-cells of people with steroid-resistant asthma weren't up to par in producing a chemical called IL-10. That chemical helps tame immune responses tied to asthma and allergies.

Next, the scientists exposed the T-cells to vitamin D-3. When that happened, the T-cells were more sensitive to steroids and boosted production of IL-10.

No breathing tests or patient surveys were done to see if people breathed better or wheezed less.

New Hope

"The hope is that this work will lead to new ways to treat people who don't respond to steroid treatment as it currently stands," Hawrylowicz says, in a news release.

"It could also help those people who are on heavy doses of steroids to reduce the amount of medication they are taking," she says.

When Is Your Asthma Worse?

When Is Your Asthma Worse?

Take the WebMD Asthma assessment to get Personalized Action Plan

Start Now

Today on WebMD

Lung and bronchial tube graphic
5 common triggers.
group jogging in park
Should you avoid fitness activities?
asthma inhaler
Learn about your options.
man feeling faint
What’s the difference?
Madison Wisconsin Capitol
woman wearing cpap mask
red wine pouring into glass
Woman holding inhaler
Man outdoors coughing
Lung and bronchial tube graphic
10 Worst Asthma Cities