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Vitamin A Requirement Assessed by Isotope Dilution Technique and Beta-carotene Intervention Trial

Vitamin A Requirement Assessed by Isotope Dilution Technique and Beta-carotene Intervention Trial

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ChiCTR
Registry ID
ChiCTR-IOD-16009436
Enrollment
Unknown
Registered
2016-10-15
Start date
2013-08-19
Completion date
Unknown
Last updated
2017-04-18

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

Conditions

Vitamin A requirement

Interventions

A Low dose group:Supplemented with 1.8 mg all-trans ß-carotene daily for 4 months
B Middle dose group:Supplemented with 3.6 mg all-trans ß-carotene daily for 4 months
C High dose group:Supplemented with 5.4 mg all-trans ß-carotene daily for 4 months
D Control group:Supplemented with 0 mg all-trans ß-carotene daily for 4 months

Sponsors

Nanjing Medical University
Lead Sponsor

Eligibility

Sex/Gender
All
Age
24 Years to 60 Years

Inclusion criteria

Inclusion criteria: Generally healthy adults free from acute and chronic diseases with BMI ranged from 18.5 to 28.0kg/m2, middle school education degree or higher, and normal CPR (< 5mg/L).

Exclusion criteria

Exclusion criteria: Having habit of smoking and drinking. Having received any nutritional supplement during the 1 month before recruitment.

Design outcomes

Primary

MeasureTime frame
Liver vitamin A reserve before intervention;Serum concentration of vitamin A;Serum concentration of ß-carotene;Serum concentration of a-carotene;Serum concentration of zeaxanthin/cryptoxanthine;Serum concentration of lycopene;Liver vitamin A reserve after intervention;—

Countries

China

Contacts

Public ContactZhixu Wang

Nanjing Medical University

zxwang@njmu.edu.cn+86 25 86868459

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026