was ist ft3 und ft4 — what can you do yourself?

FT3 and FT4 are the free (active) thyroid hormones: FT4 (thyroxine) is produced in the thyroid gland and converted into the more potent FT3 (triiodothyronine). Their blood levels indicate thyroid function. What you can do yourself: Ensure adequate iodine and selenium intake to support hormone synthesis and conversion (e.g., via sea fish, Brazil nuts). Chronic stress and lack of sleep may impair FT4-to-FT3 conversion. However, self-management without medical guidance is risky – thyroid disorders (e.g., Hashimoto, Graves‘) require medication. Measuring FT3/FT4 alone without TSH and antibodies is of limited value. Evidence: mechanistic/nutritional physiology; no direct intervention studies from the provided context.