Is TSH Schilddrüse useful for gut health?

TSH (thyroid-stimulating hormone) is a standard thyroid marker, not a direct measure of gut health. While there is a recognized gut–thyroid axis—where the microbiome influences thyroid hormone conversion and autoimmune conditions like Hashimoto’s—a single TSH value from a consumer test cannot assess gut microbiota composition, intestinal permeability, or inflammation. The evidence for TSH as a gut health biomarker is weak and primarily mechanistic; no validated thresholds exist for gut-related outcomes. Consumer tests marketing TSH for gut health often blur the line between marketing and evidence-based medicine. For a meaningful gut health assessment, established stool tests (microbiome, calprotectin, zonulin) or clinical evaluation are more appropriate. Caveat: TSH testing should be interpreted by a physician, especially if thyroid dysfunction is suspected. Self-diagnosis or treatment based on a single TSH value is not recommended.