Clinical trial registry record

High-dose Vitamin D Supplements in Older Adults

A registered PHASE2 study indexed because it matched monitored longevity research terms. Registry status: Active Not Recruiting. Registration does not establish safety or effectiveness.

Plain-language guide

Five questions to ask about this record

What this is
A clinical study registration, not a result or recommendation.
Why it may matter
The registry currently reports Active Not Recruiting.
Evidence
Registered phase 2 study.
Main limitation
Registration does not prove that the intervention works, is safe, or is available to you.
What changed
Registry metadata was last updated April 3, 2026.
Where to verify
Open the primary registry below for eligibility, locations, contacts, and current status.
Registry ID
NCT03613116
Last registry update
April 3, 2026
Status
Active Not Recruiting
Phase
Phase 2
Sponsor
University of California, Davis
Enrollment
180
Countries
United States
Match confidence
100%
Source feed
ClinicalTrials.gov
Automated source synopsis

A registered PHASE2 study indexed because it matched monitored longevity research terms. Registry status: Active Not Recruiting. Registration does not establish safety or effectiveness.

Evidence snapshot

What the source actually supports

Evidence stage
Phase 2
Study design
RANDOMIZED · PARALLEL · TREATMENT · QUADRUPLE
Evidence population
Human clinical study registration
Participants
180
Population
ALL · 65 Years to 90 Years
Duration
2019-03-18 to 2026-12-31
Intervention
Vitamin D3
Comparator
Standard Dose Vitamin D3
Outcomes measured
Correction of VitD insufficiency — Expect vitamin D levels to correct by 1-2 month on treatment; SENAS Executive Function Composite Score — 3.5 years; Evaluate effect of VitD on Cognitive Change — 3.5 years
Reported result
No reusable finding-level result is available in this record.

Main limitationThis is a study registration. No reusable structured result is available here, so it cannot show whether the intervention worked or was safe.

Safety and approvalEligibility, adverse-event details, and clinical decisions must be checked in the official registry and with qualified clinicians. Trial registration is not regulatory approval and does not establish that an intervention is available.

Source supportStructured registry protocol metadata; no finding-level conclusion is generated.

Trial stage · Phase 2A trial phase describes development stage; it does not establish a positive result.
Phase 1Phase 2Phase 3Phase 4

Registration and recruitment status do not establish safety, efficacy, or regulatory approval.

Why this record appears here · 100% topic match

The title, summary, or source keywords matched one or more topics followed by immortal.life. A higher percentage means a stronger topic match; it does not rate safety, effectiveness, or study quality.

  • Vitamin D and ageing · 100%Title contains controlled topic terminology. Summary contains controlled topic terminology. Source terminology contains a controlled topic term. Title supplies ageing or longevity context.

Automated source check 100% · update recency 100%. These figures help sort records; they are not medical ratings.

vitamin d aging
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