Myths vs facts: TSH Schilddrüse and skin aging

The thyroid gland and its hormones (TSH, fT3, fT4) influence skin metabolism. A common myth is that a slightly elevated TSH level alone accelerates skin aging. The fact is: severe, untreated thyroid dysfunction (hypo- or hyperthyroidism) can impair skin quality – dry, flaky skin in hypothyroidism, thin, fragile skin in hyperthyroidism. However, evidence for a direct, independent effect of TSH on skin aging in euthyroid individuals is weak. Many studies show associations but not causality. Skin aging is dominated by UV exposure, collagen degradation, oxidative stress, and genetic factors. A TSH level within the normal range is not an anti-aging marker. The claim that lowering TSH through supplements rejuvenates the skin is scientifically unsupported and can even be dangerous (risk of hyperthyroidism). In summary: thyroid diseases can cause skin issues, but TSH alone is not a reliable indicator or target for skin aging prevention. The evidence base is mixed, relying mostly on observational studies and mechanistic reasoning.