IGF-1 (Somatomedin C): the primary marker of GH activity
I've summarized those guidelines below with a link to the warning labels
Aoki-Yoshida A, Aoki R, Moriya N, Goto T, Kubota Y, Toyoda A, et al
Laboratories buying for research commonly record product name, catalog reference, vial size, receipt date, storage conditions, and preparation timing, and the retatrutide listing supports these practices through specification forward fields and stable ordering structure
Verify with multiple sources
But they are not the same compound, and they do not work through the same biological pathway