Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy - Full Text View

Sponsored by:	University of Wisconsin, Madison
Information provided by:	University of Wisconsin, Madison
ClinicalTrials.gov Identifier:	NCT00692120

Purpose

Vitamin D is available in two forms, vitamin D2 and vitamin D3. It has previously been assumed that these two forms maintain blood vitamin D equally. However, this may not be the case. This study will evaluate whether D2 and D3 produce equal elevation of blood vitamin D. Additionally, it will evaluate whether once per month vitamin D dosing is as effective in maintaining blood vitamin D levels as daily dosing.

Condition	Intervention
Vitamin D Inadequacy Vitamin D Deficiency	Dietary Supplement: Cholecalciferol (vitamin D3) Dietary Supplement: Ergocalciferol (vitamin D2) Dietary Supplement: Placebo

MedlinePlus related topics: Dietary Supplements

Drug Information available for: Vitamin D Ergocalciferol Cholecalciferol

U.S. FDA Resources

Study Type:	Interventional
Study Design:	Treatment, Randomized, Double Blind (Subject, Investigator), Parallel Assignment, Safety/Efficacy Study
Official Title:	Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy

Further study details as provided by University of Wisconsin, Madison:

Primary Outcome Measures:

The primary outcome measure is change in 25OHD with various D2 and D3 dosing regimens. [ Time Frame: 12 months ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:

Determine whether once monthly vitamin D2 or D3 dosing is as effective as daily dosing in attainment, and subsequent maintenance, of 25OHD status [ Time Frame: 12 months ] [ Designated as safety issue: Yes ]
Delineate the effect of these vitamin D regimens on other parameters of skeletal relevance [ Time Frame: 12 months ] [ Designated as safety issue: Yes ]

Enrollment:	64
Study Start Date:	February 2007
Estimated Primary Completion Date:	November 2008 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
1: Experimental	Dietary Supplement: Ergocalciferol (vitamin D2) oral capsule 50,000 IU once monthly for 12 months Dietary Supplement: Placebo oral placebo capsule once daily for 12 months
2: Experimental	Dietary Supplement: Ergocalciferol (vitamin D2) oral capsule 1600 IU once daily for 12 months Dietary Supplement: Placebo oral placebo capsule once daily for 12 months
3: Experimental	Dietary Supplement: Cholecalciferol (vitamin D3) 50,000 IU once monthly for 12 months Dietary Supplement: Placebo oral placebo capsule once daily for 12 months
4: Experimental	Dietary Supplement: Cholecalciferol (vitamin D3) oral capsule 1600 IU once daily for 12 months Dietary Supplement: Placebo oral placebo capsule once daily for 12 months

Eligibility

Ages Eligible for Study:	65 Years and older
Genders Eligible for Study:	Both
Accepts Healthy Volunteers:	Yes

Criteria

Inclusion Criteria:

Community dwelling men and women age ≥ 65 years.
Able and willing to sign informed consent.
Serum 25OHD concentration ≥ 10 and less than 60 ng/ml by HPLC.
Willing to avoid use of cod-liver oil and non-study vitamin D supplementation; standard multiple vitamins containing ≤ 400 IU used no more than once daily will be allowed

Exclusion Criteria:

Current hypercalcemia (serum calcium > 10.5 mg/dl) or untreated primary hyperparathyroidism.
History of nephrolithiasis.
Screening 25OHD concentration ≥ 60 ng/ml.
Baseline 24-hour urine calcium > 250 mg if female, > 300 mg if male.
Known risk factors for hypercalcemia, e.g., malignancy, tuberculosis, sarcoidosis, Paget's disease
History of any form of cancer within the past five years with the exception of adequately treated squamous cell or basal cell skin cancer.
Renal failure defined as a calculated creatinine clearance (Cockroft-Gault method) ≤ 25 ml/minute
Severe end-organ disease, e.g., cardiovascular, hepatic, hematologic, pulmonary, etc., which may limit ability to complete the study
Known malabsorption syndromes, e.g., celiac disease, radiation enteritis, active inflammatory bowel disease, etc.
Use of medications known to alter bone turnover including bisphosphonates, estrogen, selective estrogen receptor modulators, PTH, testosterone or calcitonin
Vitamin D intake greater than 5,000 IU daily
Treatment with any active metabolites of vitamin D within six months of screening
Treatment with any drug which may interfere with vitamin D metabolism, e.g., phenobarbital, phenytoin.

Contacts and Locations

Please refer to this study by its ClinicalTrials.gov identifier: NCT00692120

Locations

United States, Wisconsin
UW Osteoporosis Clinical and Research Program
Madison, Wisconsin, United States, 53705

Sponsors and Collaborators

University of Wisconsin, Madison

Investigators

Principal Investigator:

Neil Binkley, MD

University of Wisconsin - Institute on Aging

More Information

Responsible Party:	University of Wisconsin - Institute on Aging ( Neil Binkley, MD )
Study ID Numbers:	2006-0013
Study First Received:	January 2, 2008
Last Updated:	June 5, 2008
ClinicalTrials.gov Identifier:	NCT00692120
Health Authority:	United States: Institutional Review Board

Study placed in the following topic categories:

Vitamin D Deficiency
Cholecalciferol
Vitamin D
Malnutrition

Avitaminosis
Ergocalciferols
Nutrition Disorders
Deficiency Diseases

Additional relevant MeSH terms:

Growth Substances
Vitamins
Physiological Effects of Drugs

Bone Density Conservation Agents
Micronutrients
Pharmacologic Actions

ClinicalTrials.gov processed this record on January 16, 2009