Vitamin D Supplement Study for Adolescents

V.I.P. Feasibility Study (Vitamin D Intake Project)

The purpose of this study is to determine if 14-19 year old African American adolescents are able to take a daily vitamin D supplement daily for about 4 months and how well a daily dose of 400 IU or 2000 IU vitamin D supplement raises their vitamin D blood level.

To determine the feasibility of African American teenagers taking a daily vitamin D supplement over a 4 month period in terms of compliance and practical implementation.

To determine the differences in response in blood 25-OH D level between those randomly assigned to taking a 400 IU supplement versus 2000 IU per day and to determine if there are differences in blood 25-OH D level response depending on subject gender and overweight/obese versus healthy-weight status.

Inclusion Criteria:

• Healthy African American Adolescents

Exclusion Criteria:

• Hypertension
• Pregnancy
• Medications that affect study outcome measures
• Use of other vitamin and/or mineral supplement or herbal supplements
• Individuals of other races