We've been getting a fair number of inquiries on this one, so we keep a steady batch running through HPLC, and the purity consistently lands at 99% or better — it's pretty much what you'd expect for solid metabolic research, though it's not for human use at all.
The freeze-dried cake is white and stable, but you'll want to handle reconstitution with sterile water or bacteriostatic, storing at -20°C to keep the 36-month shelf life intact.
Basically, most buyers go with teh 5mg per vial for routine dosing, though the 2mg and 10mg options are available too — we package them ten vials to a box with an MOQ of just one box.

Minimum order is one box, and we usually have stock on the 2mg and 5mg sizes, but confirm lead time on the 10mg since it tends to run short around the 20-day mark or so.
Actually, one thing that caught a few people off guard is the powder doesn't tolerate room temperture for long — reconstitute quickly or it can degrade, though that's more of a handling detail than a defect.
Anyway, it's better than some generic batches we've tested from other labs, and the standdard COA includes the HPLC trace with the 4112.6 g/mol molecular weight listed if that's what you need.