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Claim
Strong Support
descriptive
Analysis v3

Taking 200 micrograms of sodium selenite daily for six months does not change the levels of thyroid autoantibodies in people with mild-to-moderate Graves’ ophthalmopathy who already have sufficient...

62
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

Selenium cleans up harmful molecules in the tissue behind the eyes, which reduces swelling and redness, but it does not stop the body from making antibodies that attack the thyroid. The antibodies stay the same even when the eye symptoms get better.

Most probable mechanism

In Simple Terms

Selenium is used to make proteins that clean up harmful molecules called reactive oxygen species in the tissues behind the eyes. This reduces swelling and irritation in those tissues, but it does not change the level of antibodies that attack the thyroid gland.

Causal chain
1

Sodium selenite is absorbed and incorporated into selenocysteine for the synthesis of selenoproteins, including glutathione peroxidases

Verified by multiple studies
which leads to
2

Glutathione peroxidases reduce reactive oxygen species generated during autoimmune inflammation in orbital tissues

Supported by evidence
which leads to
3

Reduced reactive oxygen species decrease activation of orbital fibroblasts and infiltration of immune cells, lowering pro-inflammatory cytokine production

Supported by evidence
which leads to
4

Decreased orbital inflammation improves clinical signs such as eyelid swelling, conjunctival redness, and proptosis

Verified by multiple studies
which leads to
5

Thyroid autoantibody titers (anti-TPO and TBII) remain unchanged despite reduced oxidative stress and orbital inflammation

Verified by multiple studies

Less supported by current evidence, but not ruled out

In Simple Terms

B vitamins support energy production in immune cells and directly neutralize harmful molecules called reactive oxygen species, which reduces tissue swelling behind the eyes, but does not change the amount of antibodies targeting the thyroid.

Causal chain
1

B vitamins (B12, folate, B6) act as cofactors for enzymes involved in one-carbon metabolism and mitochondrial energy production in immune cells

Indirect evidence only
which leads to
2

Vitamin B12 directly scavenges reactive oxygen species in thyroid and orbital tissues

Indirect evidence only
which leads to
3

Reduced oxidative stress and improved immune cell regulation decrease orbital inflammation without altering autoantibody production

Indirect evidence only

Evidence from Studies

Supporting (1)

62

Community contributions welcome

62

Efficacy of selenium supplementation for mild-to-moderate Graves’ ophthalmopathy in a selenium-sufficient area (SeGOSS trial): study protocol for a phase III, multicenter, open-label, randomized, controlled intervention trial

Randomized Controlled Trial
Human
2023 Apr 14

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

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Source Study

Efficacy of selenium supplementation for mild-to-moderate Graves’ ophthalmopathy in a selenium-sufficient area (SeGOSS trial): study protocol for a phase III, multicenter, open-label, randomized, controlled intervention trial

Score: 62
DOI: 10.1186/s13063-023-07282-4

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In people with mild to moderate Graves ophthalmopathy in areas where selenium levels are adequate, taking 200 mcg of selenium daily for 3 to 6 months does not change the levels of thyrotropin-receptor antibodies or thyroid peroxidase antibodies.

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In adults with mild-to-moderate Graves’ eye disease living in areas with adequate selenium levels, taking 200 micrograms of sodium selenite daily for six months leads to more patients showing improvement in eye symptoms than taking vitamin B complex alone.

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Taking selenium supplements at 100–300 micrograms per day for 3 to 6 months may lead to a small rise in thyroid-stimulating hormone levels in adults with Graves' disease who are on antithyroid drugs, but this change does not continue after 6 months.

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In patients with mild Graves’ ophthalmopathy, taking 200 mcg of selenium daily for six months is associated with a reduction in swelling of the eye tissues and improved clinical activity scores compared to those not taking selenium.

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In people with Graves' disease taking antithyroid medications, adding selenium may lead to faster normalization of thyroid hormone levels at six months, but this effect does not last until nine months and differs depending on the type and amount of selenium used.

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