Engel, M
At YoungerMeMD, we prescribe both regularly, and the right choice depends on your labs, your goals, and where you are in life
The evidence base is preclinical for IGF-1 LR3 specifically, with adjacent human data from native rhIGF-1 (mecasermin/Increlex)
Each cell carries two grades: clinical evidence (human-RCT depth for this specific outcome) and community evidence (real-world adoption)
Several research peptides we list including BPC-157, TB-500, GHRPs, and IGF-1 LR3 are listed on the WADA Prohibited List under classes S0 (unapproved substances) and S2 (peptide hormones and growth factors)
Avoid These Red Flags As you research, youll likely come across websites selling peptides for "research purposes only." Steer clear of these sources