IGF-1 LR3
Also known as: Long R3 IGF-1 · IGF-1 Long R3
A long-acting analog of insulin-like growth factor 1, modified to resist binding proteins so it stays active longer, and discussed mainly in the context of muscle growth and recovery.
Class
IGF-1 analog
Default unit
mcg
Common route
Subcutaneous
Typical half-life
~20–30 hours
Frequency
Daily
Commonly associated areas
Illustrative map of the body systems IGF-1 LR3 is most often discussed in relation to. Relative emphasis only — not a measure of efficacy or a medical claim.
Proposed mechanisms / pathways
What is IGF-1 LR3?
IGF-1 LR3 is a modified version of insulin-like growth factor 1 (IGF-1), a hormone the body produces largely in response to growth hormone. The "LR3" stands for Long R3 — the molecule carries an added amino-acid sequence and a substitution at position 3 that make it resist the binding proteins (IGFBPs) that would normally inactivate native IGF-1. The practical result is a much longer-acting analog that stays biologically available for far longer than the body’s own IGF-1.
How it is thought to work
IGF-1 is the downstream signal through which much of growth hormone’s anabolic effect is thought to be carried out. IGF-1 LR3 is reported to bind the IGF-1 receptor and activate the PI3K/Akt/mTOR signaling cascade associated with cell growth, protein synthesis, and proliferation. Because it evades the binding proteins that buffer natural IGF-1, it is described as having a stronger and more sustained signal, though the way this translates to real-world outcomes in people is not well characterized.
Educational only — not medical advice
IGF-1 LR3 is a research chemical and is not an approved medication for general human use. Nothing here is a recommendation, dose, or medical claim. Consult a qualified healthcare provider and follow the laws in your area.
Tracking IGF-1 LR3 in LynkDose
Because IGF-1 LR3 is long-acting and tracked in micrograms, small logging differences add up over a cycle. Record each dose and time, rotate and note injection sites, and let LynkDose chart the trend alongside training performance, weight, and recovery metrics from Apple Health. The value of a tracker here is seeing the multi-week pattern rather than reacting to any single day.
Commonly discussed for
- Muscle growth and hypertrophy interest
- Recovery and tissue repair
- Body-composition and performance goals
Often stacked: Sometimes discussed alongside GH-axis peptides like CJC-1295 and Ipamorelin, or with MGF, since IGF-1 sits downstream of the growth-hormone pathway.
How to track IGF-1 LR3 in LynkDose
IGF-1 LR3 is long-acting, so log the dose and time once daily and keep injection sites consistent. Track recovery, training performance, and body-composition trends over weeks rather than expecting day-to-day signal.
Deeper read: How to Track a Peptide Cycle: A Complete Guide
Not medical advice
This page is educational and does not recommend, prescribe, or dose any compound. Many peptides are research chemicals not approved for general human use. Always consult a qualified healthcare provider and follow the laws in your area.