IGF-1 LR3

Insulin-like Growth Factor 1 Long Arg3- better known as IGF-1 LR3 is a modified version of the naturally occurring IGF-1 hormone, prized for its ability to increase muscle hypertrophy, enhance recovery, and promote cellular growth. With a longer half-life and enhanced potency compared to standard IGF-1, LR3 has quickly become a go-to peptide for athletes looking to build muscle, retain gains after a cycle, or accelerate healing.

IGF-1 is naturally stimulated by growth hormone via the liver. However, using IGF-1LR3 exogenously bypasses the GH pathway, providing a direct and targeted hypertrophic effect- especially valuable in post-cycle therapy, injury recovery, or advanced bulking phases.

IGF-1LR3 is one of the most potent muscle-building peptides available due to its ability to stimulate new muscle cell growth, not just increase the size of existing fibers. For this reason, it’s often described as an anabolic amplifier-especially when used alongside resistance training or post-anabolic steroid cycles.