Iodine Status of Mother-Infant Dyads from Montréal, Canada: Secondary Analyses of a Vitamin D Supplementation Trial in Breastfed Infants.

Background: Most pregnant or lactating women in Canada will not meet iodine requirements without iodine supplementation.

Objectives: To assess the iodine status of 132 mother-infant pairs based on secondary analyses of a vitamin D supplementation trial in breastfed infants from Montréal, Canada.

Methods: Maternal iodine status was assessed using the breastmilk iodine concentration (BMIC).