So you're looking into semaglutide sourcing for your UK procurement list—most buyers we deal with are procurement folks from contract research organisations or academic labs, and they've usually been burned by a supplier with spotty documentation or shipping delays that cost them weeks.
We're at 99.9% purity on this one, which is better than reagent grade for this type of work, and teh HPLC runs are included with every batch—just ask for the COA when you place the order, we've got those on file, and you'll also get the MSDS; the CAS is 7732-18-5, molecular weight 18.01 g/mol, and it come as a in 2mg, 5mg, or 10mg strengths depending on your protocol, packed 10 vials per pack.

What you'll get, pretty much, is the peptide itself plus your choice of bacteriostatic water (3ml, 5ml, or 10ml) for reconstitution, and we always include a TDS with shipment so you know exactly what you're handling—storage is 2-8°C in lyophilized form, but drop it to -20°C once reconstituted.

It's not ideal for anything beyond research use, obviously—this is pharmaceutical grade material, but our company can't ship it for human consumption, and the lead time is usually 10-14 working days for UK dilevery, though we do have stock on the 10mg vials most of the time.
One thing some buyers miss is that we don't require prepayment on first orders from verified institutions—net 30 terms are avaliable after a quick credit check, and we'll handle shipping with temperature-controlled packaging (check lead time for that, as it adds a day or so).