Description Module
The Description Module contains narrative descriptions of the clinical trial, including a brief summary and detailed description. These descriptions provide important information about the study's purpose, methodology, and key details in language accessible to both researchers and the general public.
Description Module path is as follows:
Study -> Protocol Section -> Description Module
Description Module
Ignite Creation Date:
2025-12-24 @ 9:21 PM
Ignite Modification Date:
2025-12-24 @ 9:21 PM
NCT ID:
NCT00494104
Brief Summary:
Breastfed infants living in a northern location (41 degrees N) are at high risk of vitamin D deficiency during winter. This trial is designed to determine how much supplemental vitamin D breastfed infants need to receive in order to remain free of vitamin D deficiency
Detailed Description:
It is increasingly being recognized that infants and children living at northern latitudes are at risk of vitamin D deficiency, especially if their skin is darkly pigmented. The study by the PI (Pediatrics 2006;118:603) was the first to demonstrate that infants with light skin pigmentation living at 41 degrees north are at risk of vitamin D deficiency. During winter (December - April) a full 78% of infants were vitamin D deficient if they did not receive vitamin D from an external source. Very few breastfed babies are currently receiving supplemental vitamin D. The recommended dose is 200 IU/day. However, there are questions about the adequacy of this dose of vitamin D for the prevention of vitamin D deficiency. The present trial is designed to determine whether a dose of 200 IU/day is effective or whether doses of 400 IU/day, 600 IU/day or 800 IU/day are required to prevent vitamin D deficiency reliably.
The trial is a randomized, prospective double-blind trial in which breastfed infants will receive 200 IU/day or 400 IU/day or 600 IU/day or 800 IU/day from 1 to 9 months of age. There will not be a placebo control group. Infants will be followed through 12 months of age. Normal term infants (birth weight \>2500 g) who are born in June through November will be enrolled and randomized at 1 month of age. They will visit the study center at monthly intervals and will have capillary blood drawn at select ages. At 2 months and again in March or April whole body mineral content will be determined by DEXA. Infants will not be permitted to receive formula until 9 months of age. They may receive complementary foods beginning at 4 months of age. Vitamin D supplements will be weighed before dispensing and again when the empty and half-empty containers are returned. Study endpoints will be blood parameters and bone mineral content determined at the end of winter, i.e., between March and May 15. Blood parameters include 25-OHD, parathyroid hormone, calcium, alkaline phosphatase, osteocalcin, N-telopeptide, ferritin and transferrin receptor. 180 infants will be enrolled at 1 month of age in the expectation that 48 per group will complete the trial to at least 9 months of age.
Study:
NCT00494104
Study Brief:
Protocol Section:
NCT00494104