Is TSH Schilddrüse useful for Darmgesundheit?

The question of whether TSH (thyroid-stimulating hormone) is useful for gut health cannot be clearly answered with current evidence. TSH is a key marker of thyroid function, not directly of the gut. However, indirect links exist: hypothyroidism (elevated TSH) can contribute to slowed gut motility, constipation, and dysbiosis, while hyperthyroidism (low TSH) is associated with diarrhea and malabsorption. Nevertheless, TSH is not an established biomarker for gut health in terms of microbiome composition, inflammatory markers, or barrier function. The evidence is largely based on observational studies and pathophysiological reasoning, not on randomized controlled trials demonstrating a direct benefit of TSH measurement for gut health. Additionally, TSH varies diurnally and is influenced by many factors. A single TSH value from a home test is insufficient to assess gut health. For a comprehensive evaluation of gut health, more specific markers such as calprotectin, zonulin, or stool microbiome analysis are better suited. Therefore, using TSH alone for gut health is not recommended and should be discussed with a physician in a clinical context.