Not medical advice. Talk to your provider before using any peptide.
Full disclaimerPeptide Schedule Research TeamReviewed Apr 20267 Citations
IGF-1 LR383 residuesMFPAMPLSSLFVNGPRTLCGAELVDALQFVCGDRGFYFNKPTGYGSSSRRAPQTGIVDECCFRSCDLRRLEMYCAPLKPAKSAEach bubble = one amino acid. Size = residue mass. Color = chemical class.IGF-1 LR3 delivers 20 to 30 hours of active IGF-1 receptor stimulation per injection, far outlasting native IGF-1. Users report lean mass gains and faster recovery in 4 to 6 week cycles. No human RCT exists for anabolic use; hypoglycemia and organ growth concerns keep dosing conservative at 20 to 50 mcg per day.
20mcg · Daily
Summary: Add 1mL BAC water to your 1mg vial. Draw to 2.0 units on a U-100 syringe for a 20mcg dose. This vial will last 50 doses.
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| Level | Dose / Injection | Frequency |
|---|---|---|
| Beginner | 20mcg | Daily |
| Moderate | 40mcg | Daily |
| Aggressive | 80mcg | Daily |
Reconstitution math for a 1mg vial: add 1.0 mL bacteriostatic water. That gives you 1,000 mcg per mL. On a U-100 insulin syringe, each unit (tick mark) equals 10 mcg. So 2 IU = 20 mcg (beginner dose), 4 IU = 40 mcg (moderate), 8 IU = 80 mcg (aggressive). One vial at 40 mcg per day lasts 25 days, enough for a full 4-week cycle with one day to spare. At the beginner dose, a single vial covers 50 days. Store reconstituted vials refrigerated at 2 to 8 degrees C. Discard after 28 to 30 days. Never freeze reconstituted solution. The thing most beginners miss: eat within 15 to 30 minutes of injecting. Post-workout timing is popular because you'll be eating anyway. Morning fasted works too, just have food ready before you pin. Get baseline bloodwork (serum IGF-1, fasting glucose, HbA1c) before your first cycle. If your natural IGF-1 is already high-normal or above, adding LR3 on top increases proliferation risk.
Dosing based on Community dosing consensus from peptide research communities — 11 published references.View all sources →
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Pricing updated 2026-04-09
Prices are estimates and vary by source, location, and prescription status.Full pricing breakdown →
Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.
IGF-1 LR3 delivers 20 to 30 hours of active IGF-1 receptor stimulation per injection, far outlasting native IGF-1. Users report lean mass gains and faster recovery in 4 to 6 week cycles. No human RCT exists for anabolic use; hypoglycemia and organ growth concerns keep dosing conservative at 20 to 50 mcg per day.
