Evidence check: TSH Schilddrüse in the context of skin aging

TSH (thyroid-stimulating hormone) is a key marker of thyroid function. Thyroid hormones regulate skin metabolism, including collagen synthesis, keratinocyte turnover, and sebum production. Hypothyroidism (elevated TSH) is associated with dry, coarse skin and increased wrinkling, while hyperthyroidism (low TSH) can cause thin, moist skin. However, TSH alone is not a validated or specific biomarker for skin aging. The evidence is based on observational studies and mechanistic plausibility, not on robust causal trials. Skin aging is multifactorial, driven primarily by UV exposure, genetics, diet, and lifestyle. A single TSH measurement from a direct-to-consumer test lacks clinical context and may mislead. MyBody-X tests are not diagnostic. If TSH is abnormal or skin changes are concerning, consult an endocrinologist or dermatologist for proper evaluation.