Is FT3 useful for Abnehmen?

FT3 (free triiodothyronine) is a thyroid hormone that influences basal metabolic rate. Low FT3 levels can be associated with a slower metabolism, but measuring FT3 alone is not a reliable guide for weight loss. The evidence for using FT3 as a direct target for weight management is weak. In clinical practice, FT3 is primarily used to diagnose thyroid disorders (e.g., hypothyroidism). In euthyroid individuals (normal TSH, fT3, fT4), additional FT3 testing provides no proven benefit for weight reduction. Consumer tests that market FT3 as a 'metabolism booster' often overstate its clinical relevance. Safe use requires medical supervision – self-optimizing FT3 (e.g., via supplements) can be dangerous (risk of thyrotoxicosis).