Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial.

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00882505

Enrollment

Registered

2009-04-16

Start date

2009-04-30

Completion date

2010-08-31

Last updated

2021-12-02

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Vitamin D Deficiency

Brief summary

The objective of this study is to assess whether vitamin D supplements are sufficient to increase females who are deficient or borderline deficient in vitamin D levels to normal levels.

Interventions

DIETARY_SUPPLEMENTvitamin D

Subject will receive vitamin d supplements

OTHERPlacebo

Subject will receive a placebo.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender

FEMALE

Age

18 Years to 47 Years

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

Design outcomes

Primary

Measure	Time frame
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.	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.	3 months

Secondary

Measure	Time frame
The secondary outcome measures include evaluation of changes in other laboratory parameters associated with change in vitamin D level.	3 months

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026