was ist ft3 — what can you do yourself?

FT3 (free triiodothyronine) is the active thyroid hormone that regulates metabolism. Low FT3 may indicate hypothyroidism or reduced T4-to-T3 conversion due to nutrient deficiencies (selenium, zinc, iodine), chronic stress, or calorie restriction. What you can do yourself: Eat a balanced diet rich in selenium (Brazil nuts, fish), zinc (pumpkin seeds, meat), and adequate iodine (seaweed, iodized salt). Manage stress through sleep and relaxation, and avoid extreme diets. However, without medical testing (TSH, fT4, fT3, antibodies), self-supplementation is risky. Evidence for these measures is based on mechanistic understanding and clinical practice, not on direct studies from the provided context. Always consult a doctor before taking thyroid hormones or high-dose supplements.