IGF 1 LR3: Nasal Spray vs. Subcutaneous Injection Comparison Just over a year apart with 2 preps in between : r bodybuilding Localized Igf 1 transgene expression sustains hypertrophy and regeneration in senescent skeletal muscle Nature Genetics IGF 1 inhibits inflammation and accelerates angiogenesis via Ras PI3K IKK NF B signaling pathways to promote wound healing ScienceDirect Insulin like growth factor 1 stimulates retinal cell proliferation via activation of multiple signaling pathways ScienceDirect IGF 1 LR3 vs GH Peptides The Battle Between Performance & Risk