One buyer I know was pulling his hair out over inconsistent peptide purity from a different suplier, and that's a headache you just don't need when you're running metabolic studies.
We've been running this semaglutide batch for about six months now—it's a lyophilized white powder at 99% purity or better by HPLC, packed in 10mg vials with ten per box, and you'll want to keep it at -20°C away form light.

The EC50 values on the GIPR are pretty sharp at 0.0643 nM, which basically means it hits that receptor hard, and in our glucose tolerance assays it's been reliably consistent—though I'd avoid using it for anything in vivo since it's research use only, and the triple agonist action (GCGR, GIPR, GLP-1) makes it a solid pick for metabolic syndrome work.

Actually, most labs go with the 10mg vial size for dosing flexibility, and we've found that a single box of ten vials handles most small-scale obesity studies without needing a reorder mid-project.

MOQ is 50 vials or so, and we usually have stock ready—roughly 20 days for delivrey to the UK once you confirm the order, but check lead time if you're on a tight timeline.
2-4 weeks is the typical window for customs clearance on these, and our company can do custom packaing if you need it, though standerd box works fine for most.