Evidence check: TSH in the context of Darmgesundheit

TSH (Thyroid-Stimulating Hormone) is a classic blood marker for thyroid function, not a direct gut health parameter. However, a connection exists via the gut–thyroid axis: impaired gut barrier (leaky gut) and chronic inflammation can reduce conversion of T4 to active T3, potentially raising TSH. Absorption of iodine, selenium, and zinc – critical for thyroid hormone synthesis – depends on gut health. Additionally, Hashimoto’s thyroiditis, a common cause of elevated TSH, is linked to altered gut microbiota. Evidence is mostly human-observational and mechanistic; robust RCTs are lacking. A TSH test alone is not a direct marker of gut health, but in context of symptoms like fatigue, constipation, or weight gain, it may provide clues. If values are abnormal, medical workup is essential. Consumer DNA tests have very limited utility for TSH – TSH is measured in blood, not genetically determined. Caveat: Do not self-medicate with thyroid hormones or gut supplements without medical supervision.