Carl read the papersWhat it actually is
IGF-1 LR3 activates the IGF-1 receptor directly, skipping the GH→liver step.
The R3 modification stretches its action to ~20–30 h. It’s insulin-mimetic, which is exactly why it can drop blood sugar.
How it’s thought to work
- Direct IGF-1R activation — bypasses GH entirely.
- Long action — R3 lowers binding-protein affinity → 20–30 h vs minutes.
- Hypertrophy/hyperplasia — drives muscle growth and nutrient uptake.
- Insulin-mimetic — can crash blood glucose without warning.
What the research says
Not approved for humans (a research reagent). Essentially no human efficacy trials for physique use — the thinnest evidence and strongest bro-science on the site.
- Muscle growth / nutrient uptake (anecdotal).
- Longest-acting IGF-1 analog.
- Real hypoglycemia hazard.
Reported protocols
These are the doses the peptide community actually reports running (Reddit & forums), alongside published research — logged for education, not as a recommendation to use.
| Parameter | Commonly reported range |
|---|---|
| Community dose | 20–60 mcg/day (start 20–30 for ~7 days; ~60 is the cited ceiling) |
| Frequency | Once daily (often post-workout) |
| Route | SubQ (some local/bilateral ‘site’ injections) |
| Cycle | Short — 4–6 wks max, then break |
| Community tip | Eat 30–50 g fast carbs 15–20 min before dosing — it WILL drop your blood sugar |
Common use cases
| Goal | Community protocol notes |
|---|---|
| Muscle growth (advanced) | 20–60 mcg/day, 4–6 wks, with carbs pre-dose |
| Post-workout nutrient uptake | dose post-training |
| (Caution) | never fasted / high-volume without carbs — hypo risk |
Mixing it (reconstitution)
Freeze-dried peptides must be reconstituted with bacteriostatic water before they can be measured. Carl’s calculator turns “mg in the vial + ml of water + target dose” into “units on the syringe” — and tells you how long the vial lasts.
→ Open the Reconstitution Calculator
Injection & handling
SubQ once daily (some inject near worked muscles). The critical rule: eat 30–50 g fast carbs 15–20 min before to avoid a blood-sugar crash. Rotate 8+ sites — nodules are common. Refrigerate reconstituted.
Stacks it appears in
- Advanced / solo — IGF-1 LR3 is usually run solo by experienced users — not a beginner add.
