This paper relates T4 absorption to gastrointestinal effects. Clearing out my 2021 paper file.
Levothyroxine Therapy in Gastric Malabsorptive Disorders
January 2021 Frontiers in Endocrinology 11
DOI: 10.3389/fendo.2020.621616
Camilla Virili, Nunzia Brusca, Silvia Capriello, Marco Centanni.