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IGF-1 LR3: uses, dosing & the facts
Insulin-like Growth Factor 1 Long R3, a long-acting form of IGF-1 with increased potency and duration. Powerful anabolic and metabolic effects. This is an evidence-graded reference – what it is, what it's used for, typical reported dosing, half-life, side effects, and how to track it. It is educational, not medical advice or a recommendation to use a research compound.
- • IGF-1 LR3 – Growth factor. Insulin-like Growth Factor 1 Long R3, a long-acting form of IGF-1 with increased potency and duration.
- • Commonly used for muscle growth and size, recovery enhancement, fat loss.
- • Half-life: Approximately 20–30 hours.
- • Status: Research use only · not FDA-approved – an educational reference, not a dose protocol or sourcing advice.
What IGF-1 LR3 is
Insulin-like Growth Factor 1 Long R3, a long-acting form of IGF-1 with increased potency and duration. Powerful anabolic and metabolic effects.
What IGF-1 LR3 is used for
- • Muscle growth and size
- • Recovery enhancement
- • Fat loss
- • Joint and tendon healing
- • Skin and hair health
- • Athletic performance
These are reported/community uses, not proven clinical outcomes. Most research peptides have limited human trial data behind such claims.
Typical reported dosing
| Injectable | Beginners: 20–50mcg daily post-workout. Intermediate/Advanced: 50–100mcg daily. Some split doses AM/PM. Usually taken immediately after training to maximize muscle growth and recovery. |
Presented as commonly-reported patterns for information only – not a dose recommendation. IGF-1 LR3 dosing is a decision for a qualified clinician.
Reconstitution
Reconstitute 1mg vial with 2mL bacteriostatic water. 50mcg = 10 units. The arithmetic is the same for any peptide: concentration = vial mg ÷ water mL, and on a U-100 syringe 100 units = 1 mL. Compute your own vial with the reconstitution calculator.
Half-life & cycling
Half-life: Approximately 20–30 hours. Half-life drives dosing frequency and how quickly the compound clears – see it plotted on the IGF-1 LR3 half-life calculator.
Cycling
Typical cycles: 4–8 weeks on, 4–6 weeks off. Very potent and expensive.
Side effects & warnings
- an injection site that turns red, hot or hard, spreads, weeps, or comes with a fever – same-day medical care – research-grade material carries no sterility guarantee, so abscess and cellulitis are the documented consequence
- swelling of the lips, tongue or throat, trouble breathing, or widespread hives after a dose – emergency care
- new numbness or tingling in the hands, or hands and ankles that stay swollen – stop and get assessed – these are the classic signs of too much growth hormone signalling
- unusual thirst, or passing much more urine than normal – a blood-glucose check, since GH secretagogues raise it
- • Hypoglycemia (low blood sugar) – very important
- • Possible organ growth with long-term use
- • Water retention
- • Fatigue from low blood sugar
- • Increased hunger
Can cause dangerous hypoglycemia. Must consume simple carbs after injection. Monitor blood sugar. Very expensive. Not for beginners. Rarely exceed 100mcg/day due to risk of hypoglycemia or receptor desensitization.
Tracking IGF-1 LR3 in OptiPin
If you're tracking a IGF-1 LR3 protocol, OptiPin logs each dose with reminders and site rotation, charts the outcome you care about over your dose timeline, keeps per-vial inventory with runout warnings, and (where relevant) does the reconstitution math – all on-device, no account.
Log doses, outcomes & vials in OptiPin
Reminders, outcome-over-dose charts, vial runout warnings, and built-in reconstitution math – all on-device.
Download on the App StoreFAQ
What is IGF-1 LR3?
Insulin-like Growth Factor 1 Long R3, a long-acting form of IGF-1 with increased potency and duration. Powerful anabolic and metabolic effects.
What is IGF-1 LR3 used for?
Commonly discussed uses include: muscle growth and size, recovery enhancement, fat loss, joint and tendon healing, skin and hair health, athletic performance. These are reported uses, not proven outcomes or a recommendation.
How is IGF-1 LR3 dosed?
Commonly reported dosing: Injectable – Beginners: 20–50mcg daily post-workout. Intermediate/Advanced: 50–100mcg daily. Some split doses AM/PM. Usually taken immediately after training to maximize muscle growth and recovery.. This reflects patterns discussed in the community and is presented for information only, not as a dose recommendation – IGF-1 LR3 is not an approved medicine and dosing should involve a qualified clinician.
How do you reconstitute IGF-1 LR3?
Reconstitute 1mg vial with 2mL bacteriostatic water. 50mcg = 10 units. On a U-100 syringe, 100 units = 1 mL. Concentrations vary by vial, so compute from your own vial with a reconstitution calculator.
What is IGF-1 LR3's half-life?
Approximately 20–30 hours. Half-life shapes how often it is dosed and how quickly it clears.
What are IGF-1 LR3's side effects?
Reported effects include: hypoglycemia (low blood sugar) – very important, possible organ growth with long-term use, water retention, fatigue from low blood sugar, increased hunger. Because it is a research compound, its safety profile is not fully characterized; discuss risks with a clinician.
Evidence & further reading
- Search the peer-reviewed literature for IGF-1 LR3 on PubMed (entry point to the primary evidence base, not a specific citation).
- IGF-1 LR3 on ClinicalTrials.gov – registered human trials, if any.
- US FDA / 503A compounding status of research peptides (2026).
- OptiPin peptides guide – categories, evidence grading, and how to run a protocol honestly.
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