The Claim

In elderly individuals with low selenium status, supplementation with selenium and coenzyme Q10 for four years is associated with a reduction in cardiovascular mortality over a 10-year follow-up period, with a stronger effect observed in those with elevated baseline TSH or fT4 levels.

Source: Supplementation with selenium and coenzyme Q10 in an elderly Swedish population low in selenium — positive effects on thyroid hormones, cardiovascular mortality, and quality of life

What the research says

Supports is higher

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

Supports
81score
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

Elderly people with low selenium levels who took selenium and coenzyme Q10 supplements for four years had lower rates of death from heart disease over 10 years, especially if their thyroid hormone levels were initially elevated.

See the scientific wording

In elderly individuals with low selenium status, supplementation with selenium and coenzyme Q10 for four years is associated with a reduction in cardiovascular mortality over a 10-year follow-up period, particularly among those with elevated baseline TSH or fT4 levels, suggesting a protective effect mediated through improved thyroid hormone balance.

Why this might work

Selenium and coenzyme Q10 together boost enzymes that convert the inactive thyroid hormone T4 into the active form T3 and into a regulatory form called reverse T3. This lowers excess T4, reduces signals that overstimulate the thyroid gland, and increases the amount of active hormone available to the heart and other tissues. The improved hormone balance reduces strain on the heart, lowering the risk of fatal heart events.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Supplementation with selenium and coenzyme Q10 in an elderly Swedish population low in selenium — positive effects on thyroid hormones, cardiovascular mortality, and quality of life

    In older people with low selenium, taking selenium and CoQ10 daily for four years helped their thyroid work better and led to fewer heart-related deaths over the next 10 years, especially in those whose thyroid was already struggling.

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

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