What does IGF-1 LR3 stand for?

IGF-1 is Insulin-like Growth Factor 1. LR3 names the Long R3 modification: an arginine substitution and an N-terminal extension that reduce binding-protein affinity. This site's profile lists the full name Long R3 Insulin-like Growth Factor 1, half-life about 20 to 30 hours, molecular weight 9,111 daltons. This site's review found no published human trial. The letters are a chemical modification label, not an approval. This FAQ does not invent a human muscle result. The citations on that page are animal work, including a 2.5-fold potency comparison versus native IGF-I in dexamethasone-treated rats. Full record at /compounds/igf-1-lr3.

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of growth hormone secretagogues. Sermorelin, tesamorelin, ipamorelin, CJC-1295, and the rest of the GHRH and ghrelin receptor family.