The Claim
Selenium supplementation at doses of 100–300 μg/day for 3 to 6 months significantly reduces serum free triiodothyronine (FT3) and free thyroxine (FT4) levels in adults with Graves' disease who are receiving antithyroid medication, but these biochemical improvements are not sustained beyond 9 months of treatment.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In adults with Graves' disease taking antithyroid medication, taking selenium supplements at 100–300 μg per day for 3 to 6 months lowers levels of FT3 and FT4 hormones in the blood, but these reductions do not remain after 9 months of treatment.
See the scientific wording
Selenium supplementation at doses of 100–300 μg/day for 3 to 6 months significantly reduces serum free triiodothyronine (FT3) and free thyroxine (FT4) levels in adults with Graves' disease who are receiving antithyroid medication, but these biochemical improvements are not sustained beyond 9 months of treatment.
What the research says
1 studyStudy: Effects of Selenium Supplementation on Graves' Disease: A Systematic Review and Meta-Analysis
Taking selenium pills for a few months helped lower overactive thyroid hormones in people with Graves' disease, but after 9 months, the benefit went away — just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.