IGF-1 LR3 (Long R3 IGF-1) is a modified, long-acting analog of insulin-like growth factor 1. The modifications reduce binding-protein affinity and extend its half-life, so it's studied for prolonged IGF-1 receptor signaling.
IGF-1 signaling is downstream of growth hormone, so IGF-1 LR3 is studied in growth research contexts. It's considered advanced and isn't casually stacked with a full GH protocol — see the stacking guide.
IGF-1 LR3 usually ships in ~1 mg vials, so cost-per-mg looks high per vial. PepsTracker compares it across 27 vendors with codes applied. Platinum Peptides carries it, 15% off with pepstracker15.
IGF-1 LR3 is a long-acting IGF-1 analog studied for prolonged growth-factor receptor signaling. It is sold for research use only.
GH secretagogues raise growth hormone, which then raises IGF-1. IGF-1 LR3 acts directly at the IGF-1 receptor and is a more advanced, downstream compound.
PepsTracker normalizes IGF-1 LR3 prices to cost-per-milligram across 27 vendors — note it ships in small ~1 mg vials.