Judkins 2010.

Trial name or title	A randomised double‐blinded interventional trial to determine the effect of 50,000 IU vitamin D supplementation monthly or twice monthly from 20 weeks' gestation.
Methods	Randomised double‐masked clinical trial with randomisation at the individual level. Method of sequence generation: serial tossing of a coin. Allocation will be not concealed.
Participants	Pregnant women seeking maternity care with midwifery services involved in the study. Exclusion criteria: antenatal vitamin D level is > 75 nmol/L when enrolling in study.
Interventions	Participants will be assigned to 1 of 2 groups: group 1: will receive 50,000 IU tablets twice monthly, 2 weeks apart; group 2: will receive 50,000 IU monthly and a placebo monthly, 2 weeks apart from 20 weeks' gestation until delivery of baby. The placebo tablet contains lactose monohydrate, acacia, calcium carbonate, castor oil, maize starch, povidone, sucrose, purified talc, hydrated silica, powdered cellulose, magnesium stearate, shellac, gelatin, beeswax white, titanium dioxide and prepared theobroma.
Outcomes	Infant: vitamin D levels taken from the cord blood samples at delivery. If emergencies at delivery prevent a cord blood sample being taken then a maternal venous blood sample will be taken for analysis.
Starting date	Status: not yet recruiting participants.
Contact information	Dr Annie Judkins Newtown Union Health Service 14 Hall Ave, Newtown,. Wellington 6021, New Zealand Email: annie.judkins@nuhs.org.nz
Notes	Sponsors: Royal New Zealand College of GP's, New Zealand and Wellington Medical Research Foundation, New Zealand. ACTR Number: ACTRN12610001044011.