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Evaluation of vitamin D intake and serum 25 hydroxyvitamin D concentration on calcium metabolism

Evaluation of vitamin D3 intakes up to 15,000 international units/day and serum 25 hydroxyvitamin D concentrations up to 300 nmol/L on calcium metabolism in a community setting

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ISRCTN
Registry ID
ISRCTN18397898
Enrollment
3500
Registered
2016-06-24
Start date
2012-03-11
Completion date
Unknown
Last updated
2017-06-05

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

Conditions

Vitamin D deficiency Nutritional, Metabolic, Endocrine Vitamin D deficiency

Interventions

This study is a retrospective evaluation of blood work and clinical data collected by the Pure North program. Data included in the database were collected for new participants who entered the program
calcium homeostasis [serum calcium, 25(OH)D, PTH and urinary calcium: creatinine ratio, inflammation [high-sensitivity C-reactive protein (hs-CRP)], liver function [Alanine Amino-Transferase (ALT), Ga

Sponsors

Pure North S’Energy Foundation
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: All patients at the Pure North clinic between 2012 and 2015 and who had follow-up visits within a 6-18 month period after their first visit.

Exclusion criteria

Exclusion criteria: None

Design outcomes

Primary

MeasureTime frame
1. Calcium homeostasis is determined from serum calcium, 25(OH)D, PTH and urinary calcium:creatinine ratio at clinic visits every 12 months for 1 year (2 visits) through medical record review 2. Inflammation is determined from serum high-sensitivity C-reactive protein (hs-CRP) levels measured at clinic visits every 12 months for 1 year (2 visits)through medical record review 3. Liver function is determined from serum Alanine Amino-Transferase (ALT) and Gamma Glutamyl Transferase (GGT) levels measured at clinic visits every 12 months for 1 year (2 visits)through medical record review 4. Kidney function determined from estimated Glomerular Filtration Rate (eGFR) measured at clinic visits every 12 months for 1 year (2 visits)through medical record review

Secondary

MeasureTime frame
No secondary outcome measures

Countries

Canada

Outcome results

None listed

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