Hantoshzadeh 2017.

Trial name or title	Comparison of 2 therapeutic regimens vitamin D3 deficiency in the first trimester of pregnancy on the level of vitamin D3 in the second trimester of pregnancy
Methods	Single‐blinded randomised controlled trial
Participants	Pregnant women with: ‐ Single pregnancy ‐ Serum vitamin D level is less than 30 ng/mL ‐ Gestational age < 14 weeks ‐ Age 18‐42 years ‐ Not chronic disease, impaired absorption and metabolism of food ‐ Not receiving any supplement except multivitamins to 400 units vitamin D3, folic acid, iron · and calcium with 400 units vitamin D3
Interventions	50,000 units of vitamin D3 once a week. * Control group: 1000 unit per day. * *Both groups received these doses from week 14 of pregnancy to 10 weeks.
Outcomes	Maternal Secondary 25‐hydroxyvitamin D (25OHD) (Time point not clearly described: “before and after treatment.”)
Starting date	20 July 2016
Contact information	Dr. Sedigheh Hantoshzadeh farahnaz.rostami@modares.ac.ir
Notes	Funding: Tarbiat Modares of Medical Science Declarations of interest among primary researchers: NA City/country: Tehran, Iran