Used in cell culture and biological research to study thyroid hormone effects on metabolism, growth, and development. Commonly added to media for culturing thyroid-responsive cells, such as hepatocytes and cardiomyocytes, to maintain physiological function. Employed in assays investigating gene expression regulation, mitochondrial activity, and metabolic rate modulation. Also utilized in animal studies and in vitro models to mimic hyperthyroid or hypothyroid conditions for drug testing and disease modeling. Stable and water-soluble form ensures consistent dosing in experimental systems.