Metabolic Thyro is a 100% Food supplement that is intended to supply nutrients, glandulars, and herbs needed to maintain and support optimal thyroid health.  It contains both naturally-iodine containing kelp, plant source l-tyrosine, bovine glandulars, and herbs to support an optimally functioning thyroid. Numerous university studies have concluded that supplements containing food nutrients are better than USP isolates. Food nutrients are better because they contain important enzymes, peptides, and phytonutrients CRITICAL to the UTILIZATION of vitamins and minerals which are not present in isolated USP nutrients. Published research has concluded that food vitamins are superior synthetic/USP vitamins.