99% plus —we run it ourselves—and the holds up well at 2-8°C in the dark, though we've seen no degradation issues after 30 days or so at room temp if you're careful with it.
Mostly labs working on metabolic pathways or peptide receptor binding, the dual GIP/GLP-1 agonist mechanism means it's better than single-receptor compounds for certain dose-response studies.

We've got vials form 1mg up to 60mg, and most buyers go with teh 10mg or 30mg sizes—the 60mg is actually harder to reconstitute without clumping if you're not using the right buffer.
MOQ is 10 vials (check lead time, we usually have stock but confirm), and we'll send COA with PDFs for each batch—pretty straightforward.

One thing: this isn't suitable to acute toxicity screens or anything requiring solubility above 10 mg/mL in saline—the aggregation kicks in and messes with your data.
So for most research groups, the 5mg or 10mg vial with a 2-4 week lead time works fine; just avoid direct light during storage or it's a waste of money.
We typically require a minimum order of 10 vials, but it can vary by package size—just let us know what you need and we can work it out.
Lead time is usually 3-5 business days after order confirmation, though larger bulk orders might take a bit longer depending on stock.
Yes, every batch comes with a COA showing the HPLC purity results, so you can verify it meets the ≥99% spec.
We can customize packaging to some extent—reach out with your desired vial size and we'll see if we can accommodate it for your order.
Keep it at 2-8°C and protect from light, as specified—this preserves the powder's integrity for research use.