• The recommended daily intake of iodine in conception, pregnancy and breastfeeding is 200-250mcg. This supports the body to produce enough thyroid hormones, as these are essential to help the baby’s brain development.
• Counsel women to increase their dietary intake of iodine-rich foods or take prenatal supplements containing iodine.
• In women who have a diagnosed and treated thyroid condition, they can safely take prenatal supplements containing iodine (approximately 150mcg daily).
• They should avoid excess iodine (more than 500 mcg daily).

Read the RCOG Green-top guideline on the Management of Thyroid Disorders in Pregnancy