CompletedNot Applicable

Effects of Vitamin B12 on the Body's Internal Clock

United States10 participantsStarted 2005-04

Plain-language summary

Circadian rhythms are 24-hour cycles that influence natural functions in the body such as heart rate, blood pressure, and body temperature. Circadian rhythms provide the body with an internal clock and affect sleep patterns. The purpose of this study is to determine the effects of vitamin B12 supplements on circadian rhythms and sleep-wake regulation.

Who can participate

Age range18 Years – 30 Years

SexALL

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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * Diagnosis of delayed sleep phase syndrome OR self-described as a "night owl" Exclusion Criteria: * History of medical illness * History of psychiatric illness in participant or his or her family members * Current medication or vitamin use * Follow a vegan diet * Significant visual problem * Recent travel across time zones * History of rotating shiftwork

What they're measuring

Change in circadian period

Timeframe: first 2 weeks vs. final 2 weeks of period assessments

Trial details

NCT IDNCT00120484

SponsorBrigham and Women's Hospital

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2007-12

View on ClinicalTrials.gov More Sleep Disorders, Circadian Rhythm trials