I have found that eating seaweed and / or seafood every day keeps one replete in iodine without need for supplementation. (westonaprice.org)
Dr. Cannell's work in nutrition led to several discoveries about the overlooked need for vitamin D, and inspired him to create the Vitamin D Council in 2003 to promote the vital need for supplementation with vitamin D3. (liveinthenow.com)
It is possible for one breast to make enough milk for the baby without the need for supplementation. (verywellfamily.com)