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Iron
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- Feb 10, 2026
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Hey everyone. Need help understanding my HGH to IGF-1 conversion. I want to maximize this, not just guess.
Context:
Is 764 ng/mL on 5 IU (single bolus) good conversion, or should it be higher given my age (peak IGF-1 years)?
I'm concerned that my Carnivore/OMAD protocol might be limiting hepatic IGF-1 output because:
Thanks.
Context:
- Age: 17
- Diet: Strict Carnivore\KETO (zero to few carbs) with OMAD (One Meal A Day)
- Training: Currently none (only walking). I have muscle mass from 2 years of lifting but stopped to minimize cortisol during cut.
- HGH Protocol: 5 IU pharma grade, single bolus, first thing in the morning, fasted (not split doses). I know it's real because serum GH went from 0.15 ng/mL (baseline) to 19.80 ng/mL after 6 IU.
- Planned Addition: Retatrutide (for insulin sensitivity and appetite control).
- IGF-1: 764 ng/mL
- TSH: 2.72 µIU/mL
- fT4: 8.81 pmol/L
- Testosterone: 37.65 nmol/L (~1085 ng/dL) - This was on maintenance calories (Carnivore), not deficit.
Is 764 ng/mL on 5 IU (single bolus) good conversion, or should it be higher given my age (peak IGF-1 years)?
I'm concerned that my Carnivore/OMAD protocol might be limiting hepatic IGF-1 output because:
- No insulin spikes throughout the day (low insulin = less signaling for IGF-1 synthesis?)
- One meal means limited nutrient substrate timing around HGH pulse
- Caloric deficit (currently cutting) could be suppressing conversion
- Conversion Rate: For a 17-year-old on 5 IU (single dose), is 764 ng/mL optimal, suboptimal, or average? What would be the "target" IGF-1 for this dose at my age?
- Diet Impact: Is Carnivore/OMAD actively hurting my conversion? Would adding carbs around my one meal or switching to split doses (2.5 IU AM/PM) significantly increase IGF-1?
- Retatrutide Effect: Since Reta improves insulin sensitivity, will this increase IGF-1 conversion (better signaling) or could it lower it (reduced nutrient absorption/delayed gastric emptying)?
- No Training Factor: Without mechanical stimulus, is the IGF-1 even being utilized? Does this affect feedback loops or conversion efficiency?
- Thyroid Connection: TSH 2.72 - slightly above ideal. Could this be limiting conversion? Should I address this before adding Reta?
Thanks.

