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ForumsLab Results & BiomarkersIGF-1 levels on GLP-1 — growth hormone axis considerations

IGF-1 levels on GLP-1 — growth hormone axis considerations

EndoResFellow Thu, May 21, 2026 at 2:42 PM 16 replies 603 viewsPage 1 of 4
EndoResFellow
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May 21, 2026 at 2:42 PM#1

This gets cited here weekly, usually second-hand, so it is worth setting out what it does and does not establish.

Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect. Less adipose tissue means less aromatase activity, so in men testosterone commonly rises and estradiol falls, and SHBG rises as insulin resistance improves — which means total testosterone can rise while free testosterone moves less than expected. In PCOS, improved insulin sensitivity frequently restores ovulation, which is a fertility change people are not always expecting.

Where I think it is weakest: the comparator does most of the work in how this gets reported, and it is not the comparator most people think they are citing.

The question I want answered is why total and free can move differently here, and which of the two is worth tracking. Not looking for reassurance. Looking for the part I have got wrong.

Note on sourcing:
Figures above are from the primary publication rather than the press summary. If a number here disagrees with one you have, post yours and we will work out which of us is reading a secondary source.
20 23robert_kc, dan_philly, MeganSA_TX and 17 others
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LabKate
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May 21, 2026 at 3:01 PM#2
EndoResFellow said:
Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect.

HPA axis assessment on the hormone panel: rarely ordered but informative for understanding the stress-metabolism connection:

4-point salivary cortisol:

  • Morning: 18 ng/mL → 13 ng/mL (improved)
  • Noon: 9 ng/mL → 6 ng/mL
  • Evening: 5 ng/mL → 2 ng/mL
  • Night: 3 ng/mL → 1 ng/mL

The cortisol curve is normalizing — less flat, better diurnal variation. Reduced visceral fat = reduced cortisol overproduction. The metabolic benefits cascade into stress hormone regulation.

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Dr.ObesityMed
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May 21, 2026 at 3:20 PM#3
EndoResFellow said:
Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect.

Sex hormone labs after weight loss on the hormone panel — for the men in this thread:

Testosterone: 307 → 627 ng/dL (dramatic improvement!)
Free T: 6.2 → 13.7 ng/dL
Estradiol: 44 → 25 pg/mL
SHBG: 21 → 49 nmol/L

Visceral fat contains aromatase which converts testosterone to estrogen. As you lose visceral fat, this conversion decreases and testosterone naturally rises. I feel 10 years younger.

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anders_CPH
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May 21, 2026 at 3:39 PM#4
Dr.ObesityMed said:
Sex hormone labs after weight loss on the hormone panel — for the men in this thread: Testosterone: 307 → 627 ng/dL (dramatic improvement!) Free T:…

Hormone panel changes on the hormone panel — relevant for anyone curious about endocrine effects:

  • Testosterone: increased 42% (weight loss reduces aromatase in adipose tissue)
  • Estradiol: normalized from elevated baseline
  • SHBG: increased appropriately
  • Free testosterone: increased 18%
  • Cortisol AM: within normal limits, no significant change

My reproductive endocrinologist says the testosterone improvement alone could explain the energy and mood benefits I've experienced.

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carl_compliance
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May 21, 2026 at 5:18 PM#5
LabKate said:
HPA axis assessment on the hormone panel: rarely ordered but informative for understanding the stress-metabolism connection: 4-point salivary…

Adding a me-too, because a thread of one person's experience is not much use. The detail I would add is minor and it is already implied above.

24 2dave_SLC, FDA_TrackerJim, ricardo_MIA and 21 others
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