What Is the Difference Between IGF-1 LR3 and MGF?
Published 2026-07-11 · REVIVE Peptides Research Desk · 2 min read
Short answer: IGF-1 LR3 is a laboratory-engineered analog of the primary, liver-derived form of IGF-1 (IGF-1Ea), while MGF (mechano growth factor) refers to a different splice variant of the IGF-1 gene, IGF-1Ec, that the body produces locally in muscle tissue in response to mechanical stress. Both are studied in growth-factor research, but they represent distinct research constructs with different biological origins.
The IGF-1 gene can be spliced into more than one protein product; IGF-1Ea is the systemic, liver-produced form that circulates in the bloodstream and is the basis for both native IGF-1 and the IGF-1 LR3 analog, while IGF-1Ec (MGF) is expressed locally in tissues, including skeletal muscle, and has a distinct C-terminal peptide sequence not shared with IGF-1Ea.
Because MGF is produced locally rather than circulating systemically like IGF-1, published research has generally studied it as a locally-acting signal associated with tissue response to mechanical loading, a different research question from the systemic IGF-1 receptor signaling that IGF-1 LR3 is used to study. Synthetic MGF fragments used in research are themselves separate laboratory constructs from IGF-1 LR3, despite both deriving conceptually from the same parent gene.
Neither IGF-1 LR3 nor MGF is an approved human therapeutic, and neither is part of REVIVE LAB UAE's catalog. This comparison is general research information only and includes no dosing, administration, or protocol guidance for either compound.
Not sold by REVIVE LAB UAE. This page is published for research-education purposes only. Neither IGF-1 LR3 nor MGF is part of the REVIVE LAB UAE product catalog and no order for either can be placed on this site.
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