Can FT3 help with weight loss?

Based solely on the provided context, there is no information about FT3 (free triiodothyronine) and weight loss. The context covers STI testing and a few DNA variants (FADS1, APOA2, SOD2, MTNR1B), but nothing on thyroid hormones. FT3 is a thyroid hormone that influences metabolic rate, and some people speculate that optimizing FT3 levels could aid weight loss. However, the evidence for using FT3 supplementation or manipulation for weight loss is weak and not supported by the given sources. Moreover, artificially raising FT3 can be dangerous (e.g., cardiac strain, muscle wasting). Without clinical data or guidelines in the context, any claim remains speculative. A conservative approach is warranted.