Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial.
![]() |
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT00882505 |
Recruitment Status :
Completed
First Posted : April 16, 2009
Last Update Posted : December 2, 2021
|
- Study Details
- Tabular View
- No Results Posted
- Disclaimer
- How to Read a Study Record
Condition or disease | Intervention/treatment | Phase |
---|---|---|
Vitamin D Deficiency | Dietary Supplement: vitamin D Other: Placebo | Not Applicable |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 67 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Double (Participant, Investigator) |
Primary Purpose: | Treatment |
Official Title: | Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial. |
Study Start Date : | April 2009 |
Actual Primary Completion Date : | August 2010 |
Actual Study Completion Date : | August 2010 |

Arm | Intervention/treatment |
---|---|
Experimental: Vitamin D supplement
Receive vitamin D supplements.
|
Dietary Supplement: vitamin D
Subject will receive vitamin d supplements |
Placebo Comparator: Placebo
Receive placebo pills
|
Other: Placebo
Subject will receive a placebo. |
No Intervention: Tanning bed user
Regular tanning bed users will be assessed for their vitamin D levels.
|
- For the randomized controlled trial, the primary outcome measure is comparison of the change in vitamin D levels in the vitamin D supplementation group and the placebo group. [ Time Frame: 3 months ]
- For the comparative study, the primary outcome measure is comparison of the vitamin D level for tanning bed users compared to the level for non-tanning bed users. [ Time Frame: 3 months ]
- The secondary outcome measures include evaluation of changes in other laboratory parameters associated with change in vitamin D level. [ Time Frame: 3 months ]

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 18 Years to 47 Years (Adult) |
Sexes Eligible for Study: | Female |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- Premenopausal Caucasian women, ages 18-47
- Subjects in good health
- Tanning bed group: regular tanning bed user at least once a week for previous 10 weeks
Exclusion Criteria:
- Pregnancy and lactation
- Subjects with liver disease, renal disease, multiple myeloma, parathyroid disease, irritable bowel disease, celiac disease, cystic fibrosis and pancreatic disease
- Subjects with hypocholesterolemia and primary hyperparathyroidism
-
Subjects taking the following medications:
- Steroids
- Orlistat
- Lipid lowering medication: cholestyramine, statins
- Antiepileptic drugs: phenobarbital and phenytoin
- Currently on vitamin D supplements or using any medication contain vitamin D i.e. cod liver oil, topical calcipotriol or history of use within 1 month
- Rifampicin, isoniazid
- Ketoconazole
- Subjects currently on UV therapy

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00882505
United States, Illinois | |
Northwestern University Feinberg School of Medicine, Department of Dermatology | |
Chicago, Illinois, United States, 60611 |
Principal Investigator: | Murad Alam, MD | Northwestern University |
Responsible Party: | Murad Alam, Professor in Dermatology, Otolaryngology- Head and Neck Surgery, and Surgery-Organ Transplantation, Northwestern University |
ClinicalTrials.gov Identifier: | NCT00882505 |
Other Study ID Numbers: |
STU8461 |
First Posted: | April 16, 2009 Key Record Dates |
Last Update Posted: | December 2, 2021 |
Last Verified: | November 2021 |
Vitamin D Deficiency Avitaminosis Deficiency Diseases Malnutrition Nutrition Disorders |
Vitamin D Vitamins Micronutrients Physiological Effects of Drugs Bone Density Conservation Agents |