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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

Read the primary source rather than the write-up and the two do not agree, so here is what is actually in it.

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.

What I am after is why total and free can move differently here, and which of the two is worth tracking. Tell me what I have not thought of.

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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LipidDoc_ATL
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Atlanta, GA
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.

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

  • Testosterone: increased 35% (weight loss reduces aromatase in adipose tissue)
  • Estradiol: normalized from elevated baseline
  • SHBG: increased appropriately
  • Free testosterone: increased 22%
  • 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.

21 24traveltech_sara, AttorneyGrant, DebRD_ATL and 18 others
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mike.trainer_LA
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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.

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

4-point salivary cortisol:

  • Morning: 16 ng/mL → 14 ng/mL (improved)
  • Noon: 9 ng/mL → 5 ng/mL
  • Evening: 4 ng/mL → 2 ng/mL
  • Night: 2 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.LeslieOBGYN
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May 21, 2026 at 3:39 PM#4
mike.trainer_LA said:
HPA axis assessment on the hormone panel: rarely ordered but informative for understanding the stress-metabolism connection: 4-point salivary…

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

Testosterone: 301 → 541 ng/dL (dramatic improvement!)
Free T: 5.6 → 14.1 ng/dL
Estradiol: 48 → 27 pg/mL
SHBG: 23 → 47 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.

Last edited: May 21, 2026 at 9:39 PM
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wendy_avl
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Asheville, NC
May 21, 2026 at 5:18 PM#5
LipidDoc_ATL said:
Hormone panel changes on the hormone panel — relevant for anyone curious about endocrine effects: Testosterone: increased 35% (weight loss reduces…

Can confirm. Same sequence, different timescale. I had assumed I was the exception until I read this.

24 2RickReta_CO, PharmHunterJen, TomTeleRx and 21 others
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