Researchers studying -arrestin recruitment, internalisation kinetics, and biased signalling commonly include tirzepatide as a positive control alongside native GIP, native GLP-1, and selective single-receptor agonists such as semaglutide or exenatide
Storage matters more here than it does for a robust small molecule, because peptides are fragile: heat, light, agitation and freeze-thaw cycles all degrade them, and a degraded peptide simply under-delivers with no visible warning
This can help reduce strain on the lower back and promote better posture
Fortunately, in May 2019, another GLP-1 drug, polyethylene glycol loxenatide, was launched, effectively alleviating this embarrassing situation