Is TSH useful for skin aging?

TSH (thyroid-stimulating hormone) is a key marker of thyroid function. Thyroid dysfunction (hypo- or hyperthyroidism) can affect skin aging – e.g., dryness, loss of elasticity, or increased wrinkling. However, TSH alone is not an established biomarker for skin aging. The evidence is based on observational studies and mechanistic links, not on randomized controlled trials. Consumer tests that promote TSH as a skin-aging marker often overstate the science. A normal TSH does not rule out skin-relevant thyroid issues; additional markers like fT3, fT4, and antibodies are needed. Conclusion: TSH may be an indirect clue but not a specific skin-aging marker. For skin concerns, consult a dermatologist or endocrinologist.