About My Health Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Vitamin D Potency Varies Widely in Dietary Supplements Finds Analysis

by Rukmani Krishna on February 13, 2013 at 11:48 PM
Font : A-A+

 Vitamin D Potency Varies Widely in Dietary Supplements Finds Analysis

According to a research letter published in the journal JAMA Internal Medicine vitamin D supplement potency varies widely, and the amount of vitamin D in over-the counter and compounded supplements does not necessarily match the amount listed on the label.

The analysis showed that the amount of vitamin D in these supplements ranged from 9 percent to 146 percent of the amount listed on the label. Not only was there variation among different brands and manufacturers, but also among different pills from the same bottle.

Advertisement

"We were surprised by the variation in potency among these vitamin D pills," says Erin S. LeBlanc, M.D., MPH, lead author and investigator with the Kaiser Permanente Center for Health Research in Portland, Ore. "The biggest worry is for someone who has low levels of vitamin D in their blood. If they are consistently taking a supplement with little vitamin D in it, they could face health risks."

According to a recent editorial in the New England Journal of Medicine, more than 100 million Americans spend a combined $28 billion on vitamins, herbs, and supplements each year. The U.S. Food and Drug Administration is considering new safety guidelines for some supplements but, for the most part, the industry remains unregulated.
Advertisement

Some manufacturers participate in a voluntary quality verification program operated by the U.S. Pharmacopeial Convention (USP)—an independent, nonprofit organization that sets public standards for the quality of dietary supplements. In order to receive the USP verification mark, manufacturers' facilities undergo annual good manufacturing practice audits, and their products are tested for quality, potency, and purity. LeBlanc and her colleagues included one supplement from a USP Verified manufacturer in their sample. They found the amount of vitamin D in pills from that bottle was generally more accurate than the other bottles tested.

"The USP verification mark may give consumers some reassurance that the amount of vitamin D in those pills is close to the amount listed on the label," said Dr. LeBlanc. "There are not many manufacturers that have the USP mark, but it may be worth the extra effort to look for it."

The researchers tested 55 bottles of over-the-counter vitamin D from 12 different manufacturers. The over-the-counter vitamin D pills used in the analysis were purchased at five different stores in Portland, Ore. The compounded vitamin D was made by a compounding pharmacy in Portland. The analysis was conducted by an independent lab in Houston.

Source: Eurekalert
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Advertisement
News Category
What's New on Medindia
Western Diet may Augment the Risk of Autoimmune Diseases
Black Tea Protects against Blood Pressure and Heart Diseases
Green Mediterranean Diet may Help Repair Age-Related Brain Damages
View all

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Calcium and Vitamin Supplements Rickets Vitamin Supplements Vitamin C / Ascorbic acid Vitamin B6 Vitamin B9 Vitamin B-12 Vitamin-F Dandy Walker Syndrome Undetected Nutrient Deficiencies: the Cause of Ill Health 

Recommended Reading
Say Yes to Mushrooms
Mushrooms offer numerous applications as they can be used as food and medicine. According to ......
Calcium and Vitamin Supplements
Calcium and vitamin supplements are taken to provide the body with the ''required'' nutrients. ......
Dialysis
Dialysis is an artificial process for removing excess water and waste from the blood. Hemodialysis ....
Rickets
Encyclopedia section of medindia explains in brief about Rickets...
Dandy Walker Syndrome
Dandy-Walker syndrome is a brain malformation with symptoms of increased intracranial pressure like ...
Undetected Nutrient Deficiencies: The Cause of Ill Health
Micronutrient and antioxidant deficiencies are most common and go unnoticed. They are the root cause...
Vitamin B-12
Vitamin B-12 is also known as cobalamine or cyanocobalamine, owing to the presence of the metal, cob...
Vitamin B6
Vitamins play an equally important part in the synthesis of neurotransmitters. Neurotransmitters in ...
Vitamin B9
Vital info about vitamin B9, its molecular structure, dietary sources, beneficial aspects, symptoms ...
Vitamin C / Ascorbic acid
Vital info about vitamin C, its molecular structure, dietary sources, beneficial aspects, symptoms o...
Vitamin Supplements
Easy to understand info & tips with diagrams about vitamin supplements like vitamin C, B6, B9 & B12....
Vitamin-F
Essential fatty acids - omega 3 and omega 6 are sometimes referred to as Vitamin F. The body is not...

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2022

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use
open close
ASK A DOCTOR ONLINE
I have read and I do accept terms of use - Telemedicine

Advantage Medindia: FREE subscription for 'Personalised Health & Wellness website with consultation' (Value Rs.300/-)