The Claim
Approximately 90% of hypothyroidism cases are caused by autoimmune destruction of the thyroid gland, and selenium is present in thyroid tissue at concentrations higher than in most other organs.
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.
Most cases of hypothyroidism occur because the immune system attacks the thyroid gland, and the thyroid naturally holds more selenium than most other tissues in the body.
See the scientific wording
Approximately 90% of hypothyroidism cases result from autoimmune destruction of the thyroid gland, and selenium is concentrated in thyroid tissue at higher levels than in most other organs.
What the research says
2 studiesThis study found that giving selenium to people with an autoimmune thyroid condition lowered some harmful antibodies, which means selenium is doing something important in the thyroid — supporting the idea that selenium is concentrated there and plays a role in thyroid health.
This study found that selenium, a mineral, is packed tightly in the thyroid gland — which matches what the claim says. It doesn't prove that 90% of thyroid problems are from the immune system attacking the gland, but it does show selenium is important there, which fits with the rest of the claim.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.