The Claim
In healthy older adults, modulation of thyroid status through either recombinant human TSH or oral T3 is associated with a 6–9% increase in insulin-like growth factor 1 (IGF-1) within 24 hours, indicating that elevation of thyroid hormone levels may stimulate IGF-1 production independently of growth hormone.
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.
In older adults who are healthy, giving them thyroid hormones (either through a shot or a pill) can make a key growth-related protein called IGF-1 go up by 6–9% in just one day — and this might happen even if their growth hormone levels don’t change.
See the scientific wording
In healthy older adults, modulation of thyroid status via either recombinant human TSH or oral T3 is associated with a 6–9% increase in insulin-like growth factor 1 (IGF-1) within 24 hours, suggesting thyroid hormone elevation may stimulate IGF-1 production independently of growth hormone.
What the research says
1 studyScientists gave older adults either a TSH shot or T3 pills and found their IGF-1 levels went up by about 6–9% in a day or two — just like the claim said — without changing growth hormone, meaning thyroid hormones can boost IGF-1 on their own.
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.