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Dietary Iron Requirements
Dietary Iron Requirements in US Adults
Who can join
Ages 18 to 50 · All sexes · Healthy volunteers welcome
Full eligibility criteria
Inclusion Criteria: * Males and premenopausal females age 18-50 y * Previously participated in an iron stable isotope study or willing to consume an oral stable iron isotope and undergo a one-year equilibration period * Willing to refrain from iron-containing supplements for the duration of the study * Willing to refrain from tobacco smoking for the duration of the study * Have not donated blood 3 months prior to the start of the study and willing to refrain from donating blood for the duration of the study * Willing to have blood stored for future use * Able and willing to comply with study requirements and consent to participate Exclusion Criteria: * Females: pregnant or lactating or plans to become pregnant during the study period * Inability to provide informed consent and engage in informed consent procedures * Plans to relocate outside the study area
About the study
Dietary Reference Intakes (DRIs) for iron are based on a relatively small number of studies in European populations. This research study will determine iron needs in a representative sample of adults living in the US using the iron isotope dilution technique. Following administration and equilibration of a stable iron isotope, participants will be followed for a 12 week study period. Blood will be collected every 4 weeks and the isotopic composition will be determined. Results will help update dietary iron guidelines making sure they better match the specific needs of the US population.
What is being tested
- Stable iron isotope (other)
Sponsor: Pennington Biomedical Research Center · Participants: 300 · Started: Feb 6, 2026
Contact the study team
- Stephen Hennigar, PhD · Phone: 225-763-2612
Official record on ClinicalTrials.gov — NCT07139821
Locations in the U.S.
| Louisiana | LSU Pennington Biomedical Research Center, Baton Rouge |
| New York | Cornell University, Ithaca |
Conditions
From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.