The Claim

In patients with Hashimoto's thyroiditis, serum selenium levels are negatively correlated with free triiodothyronine (FT3) concentrations, indicating that higher serum selenium is associated with lower FT3 levels.

Source: The Impact of Selenium Deficiency and Supplementation on Hashimoto's Thyroiditis: A Clinical Evaluation.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
44score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

In people with Hashimoto's thyroiditis, higher levels of selenium in the blood are linked to lower levels of the active thyroid hormone FT3.

See the scientific wording

In patients with Hashimoto's thyroiditis, serum selenium levels are negatively correlated with free triiodothyronine (FT3), suggesting that higher selenium may be associated with reduced conversion of thyroxine to the more active thyroid hormone.

Why this might work

Higher selenium levels increase the activity of enzymes that break down the active thyroid hormone, causing less of it to be made from the storage form.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: The Impact of Selenium Deficiency and Supplementation on Hashimoto's Thyroiditis: A Clinical Evaluation.

    In people with Hashimoto’s, higher selenium in the blood was linked to lower levels of the active thyroid hormone FT3, which matches the claim that more selenium might reduce how much active hormone the body makes.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.