The Claim
Selenium supplementation at a dosage of 200 μg/day for 12 months significantly increases serum selenium levels in adults with autoimmune hypothyroidism who are receiving levothyroxine therapy, but this increase does not alter thyroid hormone conversion efficiency as measured by the free triiodothyronine–free thyroxine ratio.
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.
Taking 200 micrograms of selenium daily for a year raises selenium levels in the blood of adults with autoimmune hypothyroidism who are on levothyroxine, but it does not change how efficiently the body converts thyroxine into triiodothyronine.
See the scientific wording
Selenium supplementation (200 μg/day for 12 months) significantly increases serum selenium levels in adults with autoimmune hypothyroidism on levothyroxine, but this increase does not alter thyroid hormone conversion efficiency as measured by the free triiodothyronine–free thyroxine ratio.
What the research says
1 studyTaking selenium pills for a year didn't change how the body converts one thyroid hormone to another, even though it lowered some immune markers. So, selenium helps the immune system but doesn't make thyroid hormones work differently.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
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