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We actually went with the 10mg vials this time — the 2mg option runs out too fast for chronic dosing studies and you end up reconstituting constantly, which introduces unnecessary variability.
Stability at -20°C is decent enough for routine work, but I've seen degradation if the lyophilized cake gets exposed to temp fluctuations during shiping, so confirm cold chain handling before they dispatch.
Most buyers go with the 5mg for typical metabolic assays since it balances yield and waste, but our group needs higher concentrations for the GLP-1 receptor binding work we're running next quarter.
CAS 2381089-83-2 matches what we validated against last year, and the 99% purity by HPLC is better than reagent grade for this — though we usually run our own NMR on arrival, just to be sure.
One thing teh spec sheet doesn't mention is that white powder can clump if the vial isn't desiccated properly; we had a batch last spring that took forever to dissolve, so request fresh COAs.
Anyway, it's research-grade only, obviously not for human use, but for our in vitro protocol this is the tightest tolerance we've found without going custom synthesis.
