The Claim

The intrathyroidal T4-to-T3 conversion pathway (TSH-T3 shunt) is insufficient as a standalone mechanism for circadian thyroid hormone regulation because it cannot explain the observed phase delay between TSH and T3 rhythms or the relative amplitude of T3 compared to T4 in human circulation.

Source: PBK Modeling of Thyroid Hormone Circadian Rhythm: Elucidating Thyroidal and Extrathyroidal Contributions to Thyroid Hormone Chronobiology

What the research says

Not yet evaluated

We are still looking at what the research says.

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

How it works
1 study reviewed
In plain English

The body’s internal system that turns one thyroid hormone into another isn’t enough on its own to explain the timing and levels of these hormones throughout the day.

See the scientific wording

The intrathyroidal T4-to-T3 conversion pathway (TSH-T3 shunt) alone cannot account for the phase delay between TSH and T3 rhythms or the relative amplitude of T3 compared to T4 in human circulation, suggesting it is insufficient as a standalone mechanism for circadian thyroid hormone regulation.

What the research says

1 study

  1. Study: PBK Modeling of Thyroid Hormone Circadian Rhythm: Elucidating Thyroidal and Extrathyroidal Contributions to Thyroid Hormone Chronobiology

    The study found that the thyroid gland alone can't explain the timing and levels of the hormone T3 in the blood over the day — other tissues in the body also play a key role.

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

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