The Claim
In healthy older adults, elevation of thyroid hormone through administration of either recombinant human TSH or oral T3 is associated with a 12–16% reduction in cortisol levels over a 48–72 hour period, indicating a bidirectional regulatory relationship between the hypothalamic-pituitary-thyroid and hypothalamic-pituitary-adrenal axes.
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.
When older adults without thyroid problems are given hormones that boost thyroid activity, their stress hormone (cortisol) drops by about 12–16% over a couple of days, which suggests that the thyroid and stress systems talk to each other.
See the scientific wording
In healthy older adults, elevation of thyroid hormone via either recombinant human TSH or oral T3 is associated with a 12–16% reduction in cortisol levels over 48–72 hours, suggesting a bidirectional regulatory relationship between the hypothalamic-pituitary-thyroid and hypothalamic-pituitary-adrenal axes.
What the research says
1 studyThe study gave older adults thyroid hormones and found their stress hormone (cortisol) went down by about 15%, just like the claim said it would. So yes, the study supports the idea that thyroid and stress hormones talk to each other.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.