Nascent iodine is the ionic form of iodine (or the negatively charged ion in solution). This means it’s 100% free iodine, the form we absorb.
Nature Provides Dual-form iodine is 43% ammonium iodide and 57% iodine from kelp.The iodide separates from the ammonium in the stomach to become free iodine and this process takes place much more easily than with common forms of iodine such as potassium iodide or sodium iodide.
The iodine from kelp is free iodine. So, although our iodine is not nascent iodine, it is 100% free iodine and therefore compares favourably.