How long can you stay on IGF-1 LR3?

There’s no evidence-based answer, because IGF-1 LR3 has never been tested in a controlled human study, and we don’t provide cycles or protocols. Cycle lengths posted online aren’t drawn from clinical data. The only long-term IGF-1 use in medicine is recombinant native IGF-1 (mecasermin) for children with severe primary IGF-1 deficiency, given under specialist monitoring for blood sugar and growth.

Vendors also quote a 20 to 30 hour half-life for IGF-1 LR3, but published human pharmacokinetic data are lacking. In the lab, duration questions are really about stability: protein-sized peptides lose activity with heat and repeated freeze-thaw, so aliquot and store cold. The World Anti-Doping Agency bans IGF-1 analogs. See the specs for our IGF 1 LR3 Peptide.