The Claim
In older Chinese adults aged 65 and older, higher selenium status, as measured by whole blood and fingernail concentrations, is associated with lower thyroid-stimulating hormone (TSH) levels and higher levels of free triiodothyronine (FT3), free thyroxine (FT4), and total triiodothyronine (TT3).
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 older Chinese adults aged 65 and older, higher selenium levels in the blood and fingernails are linked to lower thyroid-stimulating hormone levels and higher levels of active thyroid hormones.
See the scientific wording
In older Chinese adults aged 65 and older, higher selenium status, as measured by whole blood and fingernail concentrations, is associated with lower thyroid-stimulating hormone (TSH) levels and higher levels of free triiodothyronine (FT3), free thyroxine (FT4), and total triiodothyronine (TT3), suggesting a link between selenium availability and increased thyroid hormone activity in this population.
More selenium in the body allows enzymes to convert the main thyroid hormone into its more active form, which tells the brain to reduce the signal that tells the thyroid to make more hormone.
What the research says
1 studyStudy: Selenium Status Associates with Thyroid Hormone and Thyroid Dysfunction in Older Chinese Adults
In older Chinese adults, people with more selenium in their blood or fingernails tended to have lower TSH and higher thyroid hormone levels, meaning their thyroid seemed more active — but the study doesn't prove selenium causes this, just that they're linked.
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.