Completed NA INTERVENTIONAL 2-arm NCT03308487

Vitamin D Supplementation and Pregnancy Outcomes

Evaluation and Comparison of the Efficacy of 1000 and 2000 IU/d Vitamin D Supplementation During Pregnancy on Maternal and Newborn Vitamin D Status and Pregnancy Outcomes

Sponsor: National Nutrition and Food Technology Institute

Conditions Maternal Vitamin D Status

Interventions Vitamin D3 (2000 IU) vitamin D3 (1000 IU)

Updated 7 times since 2017 Last updated: Feb 21, 2019 Started: Jan 31, 2017 Primary completion: Jan 31, 2018 Completion: Sep 30, 2018

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 Maternal Vitamin D Status and is currently completed. National Nutrition and Food Technology Institute leads this study, which shows 7 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

7 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
Mar 2019 — Jan 2021 [monthly]

Completed NA

Status: Recruiting → Completed

▶ Show 2 earlier versions

Jun 2018 — Mar 2019 [monthly]

Recruiting NA
Oct 2017 — Jun 2018 [monthly]

Recruiting NA

First recorded

Jan 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
Tirang R. Neyestani, Ph.D.

Data source: National Nutrition and Food Technology Institute

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

Study Locations

• Tehran, Iran