Can FT3 help with skin aging?

Whether free triiodothyronine (FT3) can help with skin aging lacks solid evidence. Thyroid hormones influence metabolism and cell turnover, including in skin. Hypothyroidism can cause dry, rough skin, while hyperthyroidism may lead to thinning and fragility. However, no controlled human studies demonstrate that raising FT3 levels in euthyroid individuals slows skin aging. In fact, unnecessary thyroid hormone supplementation carries risks such as arrhythmias, bone loss, and thyrotoxicosis. The evidence is primarily mechanistic and derived from thyroid disease states, not from anti-aging interventions. Established skin aging prevention relies on sun protection, antioxidants, retinoids, and healthy lifestyle. FT3 testing or supplementation for cosmetic purposes is not supported by evidence and may be harmful. Always consult an endocrinologist before considering any thyroid-related intervention.