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You're looking at 99% purity on NAD+ powder, and the pricing tiers make it pretty much a —sample gram runs about $X, mid-range 10 grams drops to $Y per gram, and bulk 50 grams or more hits $Z, which is better than reagent grade for this application.
What that purity means in practice is tighter tolerance on your dose-response studies than most suppilers can guarantee, and we've handled enough batches to know the lyophilized powder reconstitutes cleanly in water within seconds (usually 2-4 weeks lead time on custom orders, but check stock for standerd sizes).
663.43 g/mol molecular weight, CAS 53-84-9, and the -20°C storage requirment isn't just a suggestion—leave it out too long and you'll see degradation in the HPLC results, so we ship with dry ice and sealed foil bags.
Most buyers go with the 10mg or 50mg vials for cosmetic formulations, but the 1-gram MOQ works fine for research protocols where you're titrating doses across multiple cell lines.
One thing we don't talk about enough: this isn't suited for in vivo work without further purification steps, so keep it strictly to in vitro assays unless you've got the downstream processing lined up.
Anyway, the shelf life is 24 months when stored properly, and we usually have stock on hand, but confirm lead time for bulk custom packging—it's about 20 days or so for foil bags over 100 grams.
