Scientific Information on Serum T4
Serum T4
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Summary of Serum T4
Scientific Information on Serum T4
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Human Effect Matrix
Unlocked for Examine membersThe Human Effect Matrix looks at human studies to tell you what supplements affect Serum T4.
Full details on all Serum T4 supplements are available to Examine members.
| Grade | Level of Evidence [show legend] |
|---|---|
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Robust research conducted with repeated double-blind clinical trials |
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Multiple studies where at least two are double-blind and placebo controlled |
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Single double-blind study or multiple cohort studies |
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Uncontrolled or observational studies only |
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Level of Evidence
?
The amount of high quality evidence. The more
evidence, the more we can trust the results.
|
Supplement |
Magnitude of effect
?
The direction and size of the supplement's impact on
each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
|
Consistency of research results
?
Scientific research does not always agree. HIGH or
VERY HIGH means that most of the scientific research agrees.
|
Notes |
|---|---|---|---|---|
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Minor
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Moderate See all 5 studies |
Supplemental iodine above 500µg appears to be capable of suppressing T4 to a small degree whereas lower doses are not associated with such an effect.
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- | High See all 5 studies |
Although one study noted a decrease with 600 IU, future studies in similar persons with multiple doses have failed to replicate these observations.
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Minor
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Very High See 2 studies |
The decline in T4 hormone levels during prolonged exercise is abolished with supplementation of zin
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