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

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

Parkinson's Disease Health Center

Font Size

Coenzyme Q10 May Slow Parkinson's

High Doses of Popular Supplement Delays Deterioration


Experts are quick to advise that the finding needs to be tested in more people before coenzyme Q10 supplementation can be recommended to prevent or treat Parkinson's disease.

"Am I encouraged by the study? Yes," says Abraham Lieberman, MD, professor of neurology at the University of Miami School of Medicine. "Is it interesting? Yes. Is it innovative research? Yes. Am I convinced that everyone with Parkinson's should load up on coenzyme Q10 based on this finding? No." Lieberman is also medical director of the National Parkinson's Foundation.

"Although very promising, it was a very small study but done by very good people," Lieberman tells WebMD. "It needs to be tested in larger groups before we can recommend that people with Parkinson's go out and spend $300 a month on [coenzyme Q10]in hopes it will help them."

"While tremendously encouraging, ours is only a preliminary finding and still needs to be proved in a larger study," says Shults, who presented his study at the annual meeting of the American Neurological Association. "The next step is to do that, and we're working on a proposal to study the effects of coenzyme Q10 at even higher doses."

One concern: coenzyme Q10 is chemically similar to vitamin K, which is essential for blood clotting. "So it can negate the effectiveness of 'blood-thinning' drugs like Coumadin," says Lieberman. "While there's a study using 3000 mg of coenzyme Q10 to see its effect on ALS (amyotrophic lateral sclerosis, or "Lou Gehrig's disease"), most of the studies testing coenzyme Q10 on heart disease and other conditions involve smaller doses of around 300 mg." -->

1 | 2

Today on WebMD

Parkinsons disease illustration
Causes, symptoms, and treatments.
hands on walker
How does the disease progress?
man with serious expression
8 common questions and answers.
intelligence quotient illustration
What are the advantages of DBS?
Parkinsons Disease Medications
Questions Doctor Parkinsons
Eating Right
Parkinsons Exercise
daughter consoling depressed mother
senior man's hands
Parkinsons Daily