Buy IGF-1 LR3 — Research-Grade from QSC

IGF-1 LR3 is available from QSC Peptides at ≥99% HPLC purity with Janoshik-independent COA documentation. Free domestic shipping from USA, EU, UK, Canada, and Australia warehouses.

What Is IGF-1 LR3?

IGF-1 LR3 (Long Arg3 Insulin-Like Growth Factor-1) is a modified form of human IGF-1 featuring an arginine substitution at position 3 and a 13-amino-acid N-terminal extension peptide. These modifications dramatically reduce binding to IGF-binding proteins (IGFBPs), extending the biological half-life from ~15 minutes (native IGF-1) to 20–30 hours. IGF-1 LR3 activates the IGF-1 receptor (IGF-1R), triggering two major downstream signaling cascades: PI3K/Akt (promoting cell survival, protein synthesis, and glucose uptake) and MAPK/ERK (promoting cell proliferation and differentiation). This results in both muscle hypertrophy (cell growth) and hyperplasia (new cell formation) — a distinction from most anabolic compounds which primarily drive hypertrophy only.

Classification

Long-Acting Insulin-Like Growth Factor — Anabolic Signaling

Role in the Clavicular Ascension Stack

Within the 12-compound Clavicular Ascension Stack, IGF-1 LR3 amplifies the GH axis pathway alongside HGH and CJC-1295 No DAC. While HGH stimulates hepatic IGF-1 production and CJC-1295 enhances pulsatile GH release, exogenous IGF-1 LR3 provides direct, sustained downstream signaling that bypasses IGFBP regulation.

Specifications

Part of the Ascension Stack

IGF-1 LR3 is one of 12 compounds in the Clavicular Ascension Stack — the most comprehensive looksmaxxing research protocol available. The full stack covers 8 biological pathways with Retatrutide, Melanotan II, HGH, IGF-1 LR3, GHK-Cu, NAD+, Testosterone Cypionate, L-Glutathione, BPC-157, TB-500, CJC-1295, and Anavar.