Exclusion criteria
anaphylactic allergy, chronic kidney disease, hypercalcaemia
THYROID DISORDERS, HYPERCALCAEMIA
Enrolment in other research that could influence the outcomes of this study, monochorionic diamniotic twin pregnancies, current use of prescribed vitamin D in pregnancy >400 IU/day (or equivalent), current self-supplementation with vitamin D >400 IU/day, current use of illicit or cytotoxic drugs (excluding marijuana and alcohol), antenatal hypercalcaemia in this pregnancy (serum calcium >2.8 mmol/L or a urinary calcium:creatinine ratio >1 on two occasions), uncontrolled thyroid disorders, chronic kidney disease (≥stage 4), known anaphylactic allergy or a history of or current kidney/bladder stones.