Completed NA INTERVENTIONAL 2-arm NCT03325686

Vitamin D Supplementation in Physical Performance

Efficacy of Vitamin D Supplementation in Physical Performance of Iranian Elite Athletes

Sponsor: National Nutrition and Food Technology Institute

Interventions Placebo vitamin D supplement

Updated 6 times since 2017 Last updated: Oct 27, 2017 Started: Mar 1, 2017 Primary completion: Sep 1, 2017 Completion: Sep 30, 2017

This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

This NA trial investigates Athletes and Healthy and is currently completed. National Nutrition and Food Technology Institute leads this study, which shows 6 recorded versions since 2017 — indicating limited longitudinal coverage. The change history captured here reflects the iterative nature of clinical trial conduct.

Status Flow

Change History

6 versions recorded

Sep 2025 — Present [monthly]

Completed NA
Sep 2024 — Sep 2025 [monthly]

Completed NA
Jul 2024 — Sep 2024 [monthly]

Completed NA
Jan 2021 — Jul 2024 [monthly]

Completed NA
Jun 2018 — Jan 2021 [monthly]

Completed NA

▶ Show 1 earlier version

Nov 2017 — Jun 2018 [monthly]

Completed NA

First recorded

Mar 2017

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:

National Nutrition and Food Technology Institute

Data source: National Nutrition and Food Technology Institute

For direct contact, visit the study record on ClinicalTrials.gov .

Study Locations

• Tehrān, Iran