What role does FT4 play in Haut?

FT4 (free thyroxine) is a thyroid hormone that regulates metabolism and indirectly influences skin health. Deficiency (hypothyroidism) can cause dry, scaly skin and reduced sebum production, while excess (hyperthyroidism) is associated with increased sweating, thinner skin, and flushing. However, the provided context contains no specific data or studies linking FT4 directly to skin conditions. The evidence is therefore unclear. Routine clinical FT4 testing is not indicated for skin issues alone; it is part of thyroid function assessment. Consumer tests measuring FT4 should be interpreted cautiously, as results without medical context may lead to misjudgment. A dermatologist or endocrinologist can evaluate thyroid-related skin changes appropriately.