Background: The objective of this study was to determine the favorable effects of multi mineral-vitamin D supplementation on pregnancy outcomes among pregnant women at risk for pre-eclampsia.

Materials and Methods: This randomized single-blind controlled clinical trial was conducted among 46 pregnant, primigravida, women at risk for pre-eclampsia (aged 18-40 years) at their third trimester. Pregnant women were randomly assigned to receive either the multi mineral-vitamin D supplements (n=23) or the placebo (n=23) for 9 weeks. Fasting blood samples were taken at baseline and after applying a 9-wk intervention to measure serum calcium, magnesium, zinc, iron and 25-hydroxy vitamin D. Newborn's measurements (weight, height and head circumference) were determined.

Results: Although no significant difference was seen in newborn's weight and head circumference between the two groups, mean of newborn's length (51.3±1.7 vs. 50.3±1.2 cm, P=0.03) among the newborn's whose mothers were receiving multi mineral-vitamin D supplements were taller than those whose mothers received placebo. As compared to the placebo, consumption of multi mineral-vitamin D supplements also resulted in increased levels of serum calcium (+0.19 vs. -0.08 mg/dL, P=0.03), magnesium (+0.15 vs. -0.08 mg/dL, P=0.03), zinc (+8.25 vs. -21.38 mg/dL, P=0.001) and vitamin D (+3.79 vs. -1.37 ng/ml, P=0.01).

Conclusion: In conclusion, multi mineral-vitamin D supplementation for 9 weeks during pregnancy and in pregnant women at risk for pre-eclampsia resulted in increase of newborn's height, increased circulating levels of maternal serum calcium, magnesium, zinc and vitamin D as compared to the placebo group.