THEORETICAL
Growth Hormone
IGF-1 LR3
What Is IGF-1 LR3? Research Profile
1 min read
·
Updated: 2026-04-20
What Is IGF-1 LR3?
IGF-1 LR3 (Long R3) is an analog of insulin-like growth factor 1 with an extended N-terminus and Arg3 substitution, increasing half-life and reducing binding-protein affinity.
Dosing Protocol
For reconstitution math, reported dose ranges in the literature, administration guidance, and cycle structure, see the IGF-1 LR3 dosing protocol.
Vendor Data
Independent lab-testing results for IGF-1 LR3 vendors are published on the IGF-1 LR3 vendor rankings page.
Related
Vendor rankings for IGF-1 LR3
See every IGF-1 LR3 vendor ranked by lab purity, COA transparency, and verified $/mg →
Aggregated from independent testing programs and vendor-published COAs. Or browse all vendor grades.